Finding the Fourth Proportional to 21,082.38, 31,599.72 and 8,599.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,082.38 : 31,599.72 = 8,599.16 : x
2. Step 2: Convert to fraction form
   21,082.38/31,599.72 = 8,599.16/x
3. Step 3: Cross multiply
   21,082.38x = 31,599.72 × 8,599.16
4. Step 4: Simplify right side
   21,082.38x = 271,731,127.23
5. Step 5: Solve for x
   x = 271,731,127.23/21,082.38
6. Step 6: Final answer
   x = 12,889.02