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Finding the Fourth Proportional to 428,651.91, 643,002.16 and 129,173.85

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Solution

The fourth proportional to 428,651.91, 643,002.16 and 129,173.85 is: 193,768.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,651.91 : 643,002.16 = 129,173.85 : x
  2. Step 2: Convert to fraction form
    428,651.91/643,002.16 = 129,173.85/x
  3. Step 3: Cross multiply
    428,651.91x = 643,002.16 × 129,173.85
  4. Step 4: Simplify right side
    428,651.91x = 83,059,064,565.52
  5. Step 5: Solve for x
    x = 83,059,064,565.52/428,651.91
  6. Step 6: Final answer
    x = 193,768.10

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