Finding the Fourth Proportional to 25,456.31, 38,189.99 and 10,657.61

Step by Step Solution

1. Step 1: Write the proportion equation
   25,456.31 : 38,189.99 = 10,657.61 : x
2. Step 2: Convert to fraction form
   25,456.31/38,189.99 = 10,657.61/x
3. Step 3: Cross multiply
   25,456.31x = 38,189.99 × 10,657.61
4. Step 4: Simplify right side
   25,456.31x = 407,014,019.32
5. Step 5: Solve for x
   x = 407,014,019.32/25,456.31
6. Step 6: Final answer
   x = 15,988.73