Finding the Fourth Proportional to 31,006.10, 42,773.38 and 18,421.94

Step by Step Solution

1. Step 1: Write the proportion equation
   31,006.10 : 42,773.38 = 18,421.94 : x
2. Step 2: Convert to fraction form
   31,006.10/42,773.38 = 18,421.94/x
3. Step 3: Cross multiply
   31,006.10x = 42,773.38 × 18,421.94
4. Step 4: Simplify right side
   31,006.10x = 787,968,380.04
5. Step 5: Solve for x
   x = 787,968,380.04/31,006.10
6. Step 6: Final answer
   x = 25,413.34