Finding the Fourth Proportional to 21,513.28, 29,688.51 and 12,082.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,513.28 : 29,688.51 = 12,082.72 : x
2. Step 2: Convert to fraction form
   21,513.28/29,688.51 = 12,082.72/x
3. Step 3: Cross multiply
   21,513.28x = 29,688.51 × 12,082.72
4. Step 4: Simplify right side
   21,513.28x = 358,717,953.55
5. Step 5: Solve for x
   x = 358,717,953.55/21,513.28
6. Step 6: Final answer
   x = 16,674.26