Finding the Fourth Proportional to 21,665.16, 32,492.16 and 8,517.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,665.16 : 32,492.16 = 8,517.60 : x
2. Step 2: Convert to fraction form
   21,665.16/32,492.16 = 8,517.60/x
3. Step 3: Cross multiply
   21,665.16x = 32,492.16 × 8,517.60
4. Step 4: Simplify right side
   21,665.16x = 276,755,222.02
5. Step 5: Solve for x
   x = 276,755,222.02/21,665.16
6. Step 6: Final answer
   x = 12,774.21