Finding the Fourth Proportional to 21,057.94, 29,061.74 and 12,108.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,057.94 : 29,061.74 = 12,108.52 : x
2. Step 2: Convert to fraction form
   21,057.94/29,061.74 = 12,108.52/x
3. Step 3: Cross multiply
   21,057.94x = 29,061.74 × 12,108.52
4. Step 4: Simplify right side
   21,057.94x = 351,894,454.17
5. Step 5: Solve for x
   x = 351,894,454.17/21,057.94
6. Step 6: Final answer
   x = 16,710.78