Finding the Fourth Proportional to 25,287.72, 34,897.15 and 13,957.31

Step by Step Solution

1. Step 1: Write the proportion equation
   25,287.72 : 34,897.15 = 13,957.31 : x
2. Step 2: Convert to fraction form
   25,287.72/34,897.15 = 13,957.31/x
3. Step 3: Cross multiply
   25,287.72x = 34,897.15 × 13,957.31
4. Step 4: Simplify right side
   25,287.72x = 487,070,484.61
5. Step 5: Solve for x
   x = 487,070,484.61/25,287.72
6. Step 6: Final answer
   x = 19,261.15