Finding the Fourth Proportional to 72,003.42, 99,364.56 and 40,172.04

Step by Step Solution

1. Step 1: Write the proportion equation
   72,003.42 : 99,364.56 = 40,172.04 : x
2. Step 2: Convert to fraction form
   72,003.42/99,364.56 = 40,172.04/x
3. Step 3: Cross multiply
   72,003.42x = 99,364.56 × 40,172.04
4. Step 4: Simplify right side
   72,003.42x = 3,991,677,078.90
5. Step 5: Solve for x
   x = 3,991,677,078.90/72,003.42
6. Step 6: Final answer
   x = 55,437.33