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Finding the Fourth Proportional to 78,138.02, 117,212.09 and 31,390.89

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Solution

The fourth proportional to 78,138.02, 117,212.09 and 31,390.89 is: 47,088.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,138.02 : 117,212.09 = 31,390.89 : x
  2. Step 2: Convert to fraction form
    78,138.02/117,212.09 = 31,390.89/x
  3. Step 3: Cross multiply
    78,138.02x = 117,212.09 × 31,390.89
  4. Step 4: Simplify right side
    78,138.02x = 3,679,391,666.91
  5. Step 5: Solve for x
    x = 3,679,391,666.91/78,138.02
  6. Step 6: Final answer
    x = 47,088.37

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