Finding the Fourth Proportional to 72,168.42, 99,597.09 and 40,338.66

Step by Step Solution

1. Step 1: Write the proportion equation
   72,168.42 : 99,597.09 = 40,338.66 : x
2. Step 2: Convert to fraction form
   72,168.42/99,597.09 = 40,338.66/x
3. Step 3: Cross multiply
   72,168.42x = 99,597.09 × 40,338.66
4. Step 4: Simplify right side
   72,168.42x = 4,017,613,150.50
5. Step 5: Solve for x
   x = 4,017,613,150.50/72,168.42
6. Step 6: Final answer
   x = 55,669.96