Finding the Fourth Proportional to 31,007.28, 42,801.18 and 18,432

Step by Step Solution

1. Step 1: Write the proportion equation
   31,007.28 : 42,801.18 = 18,432 : x
2. Step 2: Convert to fraction form
   31,007.28/42,801.18 = 18,432/x
3. Step 3: Cross multiply
   31,007.28x = 42,801.18 × 18,432
4. Step 4: Simplify right side
   31,007.28x = 788,911,349.76
5. Step 5: Solve for x
   x = 788,911,349.76/31,007.28
6. Step 6: Final answer
   x = 25,442.78