Finding the Fourth Proportional to 72,153.09, 99,573.42 and 40,322.09

Step by Step Solution

1. Step 1: Write the proportion equation
   72,153.09 : 99,573.42 = 40,322.09 : x
2. Step 2: Convert to fraction form
   72,153.09/99,573.42 = 40,322.09/x
3. Step 3: Cross multiply
   72,153.09x = 99,573.42 × 40,322.09
4. Step 4: Simplify right side
   72,153.09x = 4,015,007,904.98
5. Step 5: Solve for x
   x = 4,015,007,904.98/72,153.09
6. Step 6: Final answer
   x = 55,645.68