Finding the Fourth Proportional to 23,128.16, 31,917.12 and 13,570.16

Step by Step Solution

1. Step 1: Write the proportion equation
   23,128.16 : 31,917.12 = 13,570.16 : x
2. Step 2: Convert to fraction form
   23,128.16/31,917.12 = 13,570.16/x
3. Step 3: Cross multiply
   23,128.16x = 31,917.12 × 13,570.16
4. Step 4: Simplify right side
   23,128.16x = 433,120,425.14
5. Step 5: Solve for x
   x = 433,120,425.14/23,128.16
6. Step 6: Final answer
   x = 18,726.97