Finding the Fourth Proportional to 21,059.10, 29,061.54 and 12,108.35

Step by Step Solution

1. Step 1: Write the proportion equation
   21,059.10 : 29,061.54 = 12,108.35 : x
2. Step 2: Convert to fraction form
   21,059.10/29,061.54 = 12,108.35/x
3. Step 3: Cross multiply
   21,059.10x = 29,061.54 × 12,108.35
4. Step 4: Simplify right side
   21,059.10x = 351,887,152.55
5. Step 5: Solve for x
   x = 351,887,152.55/21,059.10
6. Step 6: Final answer
   x = 16,709.51