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Finding the Fourth Proportional to 78,090.21, 117,134.28 and 18,926.40

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Solution

The fourth proportional to 78,090.21, 117,134.28 and 18,926.40 is: 28,389.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,090.21 : 117,134.28 = 18,926.40 : x
  2. Step 2: Convert to fraction form
    78,090.21/117,134.28 = 18,926.40/x
  3. Step 3: Cross multiply
    78,090.21x = 117,134.28 × 18,926.40
  4. Step 4: Simplify right side
    78,090.21x = 2,216,930,236.99
  5. Step 5: Solve for x
    x = 2,216,930,236.99/78,090.21
  6. Step 6: Final answer
    x = 28,389.35

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