Finding the Fourth Proportional to 31,531.65, 43,513.98 and 17,385

Step by Step Solution

1. Step 1: Write the proportion equation
   31,531.65 : 43,513.98 = 17,385 : x
2. Step 2: Convert to fraction form
   31,531.65/43,513.98 = 17,385/x
3. Step 3: Cross multiply
   31,531.65x = 43,513.98 × 17,385
4. Step 4: Simplify right side
   31,531.65x = 756,490,542.30
5. Step 5: Solve for x
   x = 756,490,542.30/31,531.65
6. Step 6: Final answer
   x = 23,991.47