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Finding the Fourth Proportional to 139,397.10, 192,368.46 and 78,978.93

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Solution

The fourth proportional to 139,397.10, 192,368.46 and 78,978.93 is: 108,991.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,397.10 : 192,368.46 = 78,978.93 : x
  2. Step 2: Convert to fraction form
    139,397.10/192,368.46 = 78,978.93/x
  3. Step 3: Cross multiply
    139,397.10x = 192,368.46 × 78,978.93
  4. Step 4: Simplify right side
    139,397.10x = 15,193,055,136.55
  5. Step 5: Solve for x
    x = 15,193,055,136.55/139,397.10
  6. Step 6: Final answer
    x = 108,991.19

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