Finding the Fourth Proportional to 9,250.72, 12,767.52 and 8,688.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,250.72 : 12,767.52 = 8,688.40 : x
2. Step 2: Convert to fraction form
   9,250.72/12,767.52 = 8,688.40/x
3. Step 3: Cross multiply
   9,250.72x = 12,767.52 × 8,688.40
4. Step 4: Simplify right side
   9,250.72x = 110,929,320.77
5. Step 5: Solve for x
   x = 110,929,320.77/9,250.72
6. Step 6: Final answer
   x = 11,991.43