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Finding the Fourth Proportional to 718,405.17, 991,443.78 and 396,114.77

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Solution

The fourth proportional to 718,405.17, 991,443.78 and 396,114.77 is: 546,662.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,405.17 : 991,443.78 = 396,114.77 : x
  2. Step 2: Convert to fraction form
    718,405.17/991,443.78 = 396,114.77/x
  3. Step 3: Cross multiply
    718,405.17x = 991,443.78 × 396,114.77
  4. Step 4: Simplify right side
    718,405.17x = 392,725,519,925.41
  5. Step 5: Solve for x
    x = 392,725,519,925.41/718,405.17
  6. Step 6: Final answer
    x = 546,662.99

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