Finding the Fourth Proportional to 72,185.76, 99,621.81 and 40,352.76

Step by Step Solution

1. Step 1: Write the proportion equation
   72,185.76 : 99,621.81 = 40,352.76 : x
2. Step 2: Convert to fraction form
   72,185.76/99,621.81 = 40,352.76/x
3. Step 3: Cross multiply
   72,185.76x = 99,621.81 × 40,352.76
4. Step 4: Simplify right side
   72,185.76x = 4,020,014,989.70
5. Step 5: Solve for x
   x = 4,020,014,989.70/72,185.76
6. Step 6: Final answer
   x = 55,689.86