Finding the Fourth Proportional to 21,312.98, 29,411.33 and 12,359.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,312.98 : 29,411.33 = 12,359.91 : x
2. Step 2: Convert to fraction form
   21,312.98/29,411.33 = 12,359.91/x
3. Step 3: Cross multiply
   21,312.98x = 29,411.33 × 12,359.91
4. Step 4: Simplify right side
   21,312.98x = 363,521,391.78
5. Step 5: Solve for x
   x = 363,521,391.78/21,312.98
6. Step 6: Final answer
   x = 17,056.34