Finding the Fourth Proportional to 23,131.15, 31,921.22 and 12,521

Step by Step Solution

1. Step 1: Write the proportion equation
   23,131.15 : 31,921.22 = 12,521 : x
2. Step 2: Convert to fraction form
   23,131.15/31,921.22 = 12,521/x
3. Step 3: Cross multiply
   23,131.15x = 31,921.22 × 12,521
4. Step 4: Simplify right side
   23,131.15x = 399,685,595.62
5. Step 5: Solve for x
   x = 399,685,595.62/23,131.15
6. Step 6: Final answer
   x = 17,279.11