Finding the Fourth Proportional to 15,061.59, 20,782.98 and 8,688.42

Step by Step Solution

1. Step 1: Write the proportion equation
   15,061.59 : 20,782.98 = 8,688.42 : x
2. Step 2: Convert to fraction form
   15,061.59/20,782.98 = 8,688.42/x
3. Step 3: Cross multiply
   15,061.59x = 20,782.98 × 8,688.42
4. Step 4: Simplify right side
   15,061.59x = 180,571,259.09
5. Step 5: Solve for x
   x = 180,571,259.09/15,061.59
6. Step 6: Final answer
   x = 11,988.86