Finding the Fourth Proportional to 23,131.42, 31,921.33 and 12,521.04

Step by Step Solution

1. Step 1: Write the proportion equation
   23,131.42 : 31,921.33 = 12,521.04 : x
2. Step 2: Convert to fraction form
   23,131.42/31,921.33 = 12,521.04/x
3. Step 3: Cross multiply
   23,131.42x = 31,921.33 × 12,521.04
4. Step 4: Simplify right side
   23,131.42x = 399,688,249.78
5. Step 5: Solve for x
   x = 399,688,249.78/23,131.42
6. Step 6: Final answer
   x = 17,279.02