Finding the Fourth Proportional to 72,183.09, 99,613.30 and 39,919.89

Step by Step Solution

1. Step 1: Write the proportion equation
   72,183.09 : 99,613.30 = 39,919.89 : x
2. Step 2: Convert to fraction form
   72,183.09/99,613.30 = 39,919.89/x
3. Step 3: Cross multiply
   72,183.09x = 99,613.30 × 39,919.89
4. Step 4: Simplify right side
   72,183.09x = 3,976,551,978.54
5. Step 5: Solve for x
   x = 3,976,551,978.54/72,183.09
6. Step 6: Final answer
   x = 55,089.80