Finding the Fourth Proportional to 15,061, 20,782.69 and 8,688.17

Step by Step Solution

1. Step 1: Write the proportion equation
   15,061 : 20,782.69 = 8,688.17 : x
2. Step 2: Convert to fraction form
   15,061/20,782.69 = 8,688.17/x
3. Step 3: Cross multiply
   15,061x = 20,782.69 × 8,688.17
4. Step 4: Simplify right side
   15,061x = 180,563,543.78
5. Step 5: Solve for x
   x = 180,563,543.78/15,061
6. Step 6: Final answer
   x = 11,988.82