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Finding the Fourth Proportional to 30,993.36, 42,767.64 and 18,415.68

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Solution

The fourth proportional to 30,993.36, 42,767.64 and 18,415.68 is: 25,411.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,993.36 : 42,767.64 = 18,415.68 : x
  2. Step 2: Convert to fraction form
    30,993.36/42,767.64 = 18,415.68/x
  3. Step 3: Cross multiply
    30,993.36x = 42,767.64 × 18,415.68
  4. Step 4: Simplify right side
    30,993.36x = 787,595,172.60
  5. Step 5: Solve for x
    x = 787,595,172.60/30,993.36
  6. Step 6: Final answer
    x = 25,411.74

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