Finding the Fourth Proportional to 31,007.46, 42,790.42 and 18,432.30

Step by Step Solution

1. Step 1: Write the proportion equation
   31,007.46 : 42,790.42 = 18,432.30 : x
2. Step 2: Convert to fraction form
   31,007.46/42,790.42 = 18,432.30/x
3. Step 3: Cross multiply
   31,007.46x = 42,790.42 × 18,432.30
4. Step 4: Simplify right side
   31,007.46x = 788,725,858.57
5. Step 5: Solve for x
   x = 788,725,858.57/31,007.46
6. Step 6: Final answer
   x = 25,436.65