Finding the Fourth Proportional to 21,082.55, 29,095.27 and 12,129.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,082.55 : 29,095.27 = 12,129.89 : x
2. Step 2: Convert to fraction form
   21,082.55/29,095.27 = 12,129.89/x
3. Step 3: Cross multiply
   21,082.55x = 29,095.27 × 12,129.89
4. Step 4: Simplify right side
   21,082.55x = 352,922,248.82
5. Step 5: Solve for x
   x = 352,922,248.82/21,082.55
6. Step 6: Final answer
   x = 16,740.02