Finding the Fourth Proportional to 21,099.42, 29,120.22 and 12,146.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,099.42 : 29,120.22 = 12,146.04 : x
2. Step 2: Convert to fraction form
   21,099.42/29,120.22 = 12,146.04/x
3. Step 3: Cross multiply
   21,099.42x = 29,120.22 × 12,146.04
4. Step 4: Simplify right side
   21,099.42x = 353,695,356.93
5. Step 5: Solve for x
   x = 353,695,356.93/21,099.42
6. Step 6: Final answer
   x = 16,763.27