Finding the Fourth Proportional to 21,105.27, 29,126.31 and 12,154.17

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.27 : 29,126.31 = 12,154.17 : x
2. Step 2: Convert to fraction form
   21,105.27/29,126.31 = 12,154.17/x
3. Step 3: Cross multiply
   21,105.27x = 29,126.31 × 12,154.17
4. Step 4: Simplify right side
   21,105.27x = 354,006,123.21
5. Step 5: Solve for x
   x = 354,006,123.21/21,105.27
6. Step 6: Final answer
   x = 16,773.35