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Finding the Fourth Proportional to 85,850.30, 128,410.95 and 77,029.40

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Solution

The fourth proportional to 85,850.30, 128,410.95 and 77,029.40 is: 115,217.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,850.30 : 128,410.95 = 77,029.40 : x
  2. Step 2: Convert to fraction form
    85,850.30/128,410.95 = 77,029.40/x
  3. Step 3: Cross multiply
    85,850.30x = 128,410.95 × 77,029.40
  4. Step 4: Simplify right side
    85,850.30x = 9,891,418,431.93
  5. Step 5: Solve for x
    x = 9,891,418,431.93/85,850.30
  6. Step 6: Final answer
    x = 115,217.05

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