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Finding the Fourth Proportional to 12,578.78, 18,787.79 and 11,391.12

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Solution

The fourth proportional to 12,578.78, 18,787.79 and 11,391.12 is: 17,013.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,578.78 : 18,787.79 = 11,391.12 : x
  2. Step 2: Convert to fraction form
    12,578.78/18,787.79 = 11,391.12/x
  3. Step 3: Cross multiply
    12,578.78x = 18,787.79 × 11,391.12
  4. Step 4: Simplify right side
    12,578.78x = 214,013,998.90
  5. Step 5: Solve for x
    x = 214,013,998.90/12,578.78
  6. Step 6: Final answer
    x = 17,013.89

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