Finding the Fourth Proportional to 72,153.86, 99,570.67 and 40,325.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,153.86 : 99,570.67 = 40,325.72 : x
2. Step 2: Convert to fraction form
   72,153.86/99,570.67 = 40,325.72/x
3. Step 3: Cross multiply
   72,153.86x = 99,570.67 × 40,325.72
4. Step 4: Simplify right side
   72,153.86x = 4,015,258,359.96
5. Step 5: Solve for x
   x = 4,015,258,359.96/72,153.86
6. Step 6: Final answer
   x = 55,648.56