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Finding the Fourth Proportional to 13,978.18, 20,969.61 and 6,958.57

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Solution

The fourth proportional to 13,978.18, 20,969.61 and 6,958.57 is: 10,439.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,978.18 : 20,969.61 = 6,958.57 : x
  2. Step 2: Convert to fraction form
    13,978.18/20,969.61 = 6,958.57/x
  3. Step 3: Cross multiply
    13,978.18x = 20,969.61 × 6,958.57
  4. Step 4: Simplify right side
    13,978.18x = 145,918,499.06
  5. Step 5: Solve for x
    x = 145,918,499.06/13,978.18
  6. Step 6: Final answer
    x = 10,439.02

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