Finding the Fourth Proportional to 23,128.33, 31,917.20 and 13,057.18

Step by Step Solution

1. Step 1: Write the proportion equation
   23,128.33 : 31,917.20 = 13,057.18 : x
2. Step 2: Convert to fraction form
   23,128.33/31,917.20 = 13,057.18/x
3. Step 3: Cross multiply
   23,128.33x = 31,917.20 × 13,057.18
4. Step 4: Simplify right side
   23,128.33x = 416,748,498.55
5. Step 5: Solve for x
   x = 416,748,498.55/23,128.33
6. Step 6: Final answer
   x = 18,018.97