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Finding the Fourth Proportional to 718,425.18, 991,471.32 and 396,134.28

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Solution

The fourth proportional to 718,425.18, 991,471.32 and 396,134.28 is: 546,689.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,425.18 : 991,471.32 = 396,134.28 : x
  2. Step 2: Convert to fraction form
    718,425.18/991,471.32 = 396,134.28/x
  3. Step 3: Cross multiply
    718,425.18x = 991,471.32 × 396,134.28
  4. Step 4: Simplify right side
    718,425.18x = 392,755,777,488.85
  5. Step 5: Solve for x
    x = 392,755,777,488.85/718,425.18
  6. Step 6: Final answer
    x = 546,689.88

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