Finding the Fourth Proportional to 31,080.31, 42,889.30 and 17,649.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,080.31 : 42,889.30 = 17,649.80 : x
2. Step 2: Convert to fraction form
   31,080.31/42,889.30 = 17,649.80/x
3. Step 3: Cross multiply
   31,080.31x = 42,889.30 × 17,649.80
4. Step 4: Simplify right side
   31,080.31x = 756,987,469.40
5. Step 5: Solve for x
   x = 756,987,469.40/31,080.31
6. Step 6: Final answer
   x = 24,355.86