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Finding the Fourth Proportional to 78,740.90, 108,662.93 and 42,931.51

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Solution

The fourth proportional to 78,740.90, 108,662.93 and 42,931.51 is: 59,245.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,740.90 : 108,662.93 = 42,931.51 : x
  2. Step 2: Convert to fraction form
    78,740.90/108,662.93 = 42,931.51/x
  3. Step 3: Cross multiply
    78,740.90x = 108,662.93 × 42,931.51
  4. Step 4: Simplify right side
    78,740.90x = 4,665,063,665.92
  5. Step 5: Solve for x
    x = 4,665,063,665.92/78,740.90
  6. Step 6: Final answer
    x = 59,245.75

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