Finding the Fourth Proportional to 31,531.78, 43,514.15 and 17,385.13

Step by Step Solution

1. Step 1: Write the proportion equation
   31,531.78 : 43,514.15 = 17,385.13 : x
2. Step 2: Convert to fraction form
   31,531.78/43,514.15 = 17,385.13/x
3. Step 3: Cross multiply
   31,531.78x = 43,514.15 × 17,385.13
4. Step 4: Simplify right side
   31,531.78x = 756,499,154.59
5. Step 5: Solve for x
   x = 756,499,154.59/31,531.78
6. Step 6: Final answer
   x = 23,991.64