Finding the Fourth Proportional to 23,291.55, 32,140.72 and 13,220.20

Step by Step Solution

1. Step 1: Write the proportion equation
   23,291.55 : 32,140.72 = 13,220.20 : x
2. Step 2: Convert to fraction form
   23,291.55/32,140.72 = 13,220.20/x
3. Step 3: Cross multiply
   23,291.55x = 32,140.72 × 13,220.20
4. Step 4: Simplify right side
   23,291.55x = 424,906,746.54
5. Step 5: Solve for x
   x = 424,906,746.54/23,291.55
6. Step 6: Final answer
   x = 18,242.96