Finding the Fourth Proportional to 21,105.60, 29,123.52 and 12,151.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.60 : 29,123.52 = 12,151.32 : x
2. Step 2: Convert to fraction form
   21,105.60/29,123.52 = 12,151.32/x
3. Step 3: Cross multiply
   21,105.60x = 29,123.52 × 12,151.32
4. Step 4: Simplify right side
   21,105.60x = 353,889,211.05
5. Step 5: Solve for x
   x = 353,889,211.05/21,105.60
6. Step 6: Final answer
   x = 16,767.55