Finding the Fourth Proportional to 21,059.32, 29,061.85 and 12,108.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,059.32 : 29,061.85 = 12,108.58 : x
2. Step 2: Convert to fraction form
   21,059.32/29,061.85 = 12,108.58/x
3. Step 3: Cross multiply
   21,059.32x = 29,061.85 × 12,108.58
4. Step 4: Simplify right side
   21,059.32x = 351,897,560.09
5. Step 5: Solve for x
   x = 351,897,560.09/21,059.32
6. Step 6: Final answer
   x = 16,709.82