Finding the Fourth Proportional to 72,047.16, 99,413.19 and 40,216.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,047.16 : 99,413.19 = 40,216.05 : x
2. Step 2: Convert to fraction form
   72,047.16/99,413.19 = 40,216.05/x
3. Step 3: Cross multiply
   72,047.16x = 99,413.19 × 40,216.05
4. Step 4: Simplify right side
   72,047.16x = 3,998,005,819.70
5. Step 5: Solve for x
   x = 3,998,005,819.70/72,047.16
6. Step 6: Final answer
   x = 55,491.51