Finding the Fourth Proportional to 23,200.20, 32,017.41 and 13,128.12

Step by Step Solution

1. Step 1: Write the proportion equation
   23,200.20 : 32,017.41 = 13,128.12 : x
2. Step 2: Convert to fraction form
   23,200.20/32,017.41 = 13,128.12/x
3. Step 3: Cross multiply
   23,200.20x = 32,017.41 × 13,128.12
4. Step 4: Simplify right side
   23,200.20x = 420,328,400.57
5. Step 5: Solve for x
   x = 420,328,400.57/23,200.20
6. Step 6: Final answer
   x = 18,117.45