Finding the Fourth Proportional to 31,158.81, 42,989.85 and 18,413.15

Step by Step Solution

1. Step 1: Write the proportion equation
   31,158.81 : 42,989.85 = 18,413.15 : x
2. Step 2: Convert to fraction form
   31,158.81/42,989.85 = 18,413.15/x
3. Step 3: Cross multiply
   31,158.81x = 42,989.85 × 18,413.15
4. Step 4: Simplify right side
   31,158.81x = 791,578,341.58
5. Step 5: Solve for x
   x = 791,578,341.58/31,158.81
6. Step 6: Final answer
   x = 25,404.64