Finding the Fourth Proportional to 31,385.34, 43,312.10 and 17,238.20

Step by Step Solution

1. Step 1: Write the proportion equation
   31,385.34 : 43,312.10 = 17,238.20 : x
2. Step 2: Convert to fraction form
   31,385.34/43,312.10 = 17,238.20/x
3. Step 3: Cross multiply
   31,385.34x = 43,312.10 × 17,238.20
4. Step 4: Simplify right side
   31,385.34x = 746,622,339.47
5. Step 5: Solve for x
   x = 746,622,339.47/31,385.34
6. Step 6: Final answer
   x = 23,788.89