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Finding the Fourth Proportional to 78,156.12, 117,233.16 and 18,991.62

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Solution

The fourth proportional to 78,156.12, 117,233.16 and 18,991.62 is: 28,487.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,156.12 : 117,233.16 = 18,991.62 : x
  2. Step 2: Convert to fraction form
    78,156.12/117,233.16 = 18,991.62/x
  3. Step 3: Cross multiply
    78,156.12x = 117,233.16 × 18,991.62
  4. Step 4: Simplify right side
    78,156.12x = 2,226,447,626.12
  5. Step 5: Solve for x
    x = 2,226,447,626.12/78,156.12
  6. Step 6: Final answer
    x = 28,487.18

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