Finding the Fourth Proportional to 31,405.31, 43,339.20 and 17,976.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,405.31 : 43,339.20 = 17,976.50 : x
2. Step 2: Convert to fraction form
   31,405.31/43,339.20 = 17,976.50/x
3. Step 3: Cross multiply
   31,405.31x = 43,339.20 × 17,976.50
4. Step 4: Simplify right side
   31,405.31x = 779,087,128.80
5. Step 5: Solve for x
   x = 779,087,128.80/31,405.31
6. Step 6: Final answer
   x = 24,807.50