Finding the Fourth Proportional to 23,531.16, 32,472.90 and 12,921

Step by Step Solution

1. Step 1: Write the proportion equation
   23,531.16 : 32,472.90 = 12,921 : x
2. Step 2: Convert to fraction form
   23,531.16/32,472.90 = 12,921/x
3. Step 3: Cross multiply
   23,531.16x = 32,472.90 × 12,921
4. Step 4: Simplify right side
   23,531.16x = 419,582,340.90
5. Step 5: Solve for x
   x = 419,582,340.90/23,531.16
6. Step 6: Final answer
   x = 17,830.92