Finding the Fourth Proportional to 31,006.47, 42,773.90 and 18,422.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,006.47 : 42,773.90 = 18,422.31 : x
2. Step 2: Convert to fraction form
   31,006.47/42,773.90 = 18,422.31/x
3. Step 3: Cross multiply
   31,006.47x = 42,773.90 × 18,422.31
4. Step 4: Simplify right side
   31,006.47x = 787,993,953.60
5. Step 5: Solve for x
   x = 787,993,953.60/31,006.47
6. Step 6: Final answer
   x = 25,413.86