Finding the Fourth Proportional to 81,061.50, 121,592.79 and 25,657.50

Step by Step Solution

1. Step 1: Write the proportion equation
   81,061.50 : 121,592.79 = 25,657.50 : x
2. Step 2: Convert to fraction form
   81,061.50/121,592.79 = 25,657.50/x
3. Step 3: Cross multiply
   81,061.50x = 121,592.79 × 25,657.50
4. Step 4: Simplify right side
   81,061.50x = 3,119,767,009.43
5. Step 5: Solve for x
   x = 3,119,767,009.43/81,061.50
6. Step 6: Final answer
   x = 38,486.42