Finding the Fourth Proportional to 72,182.09, 99,611.92 and 39,918.89

Step by Step Solution

1. Step 1: Write the proportion equation
   72,182.09 : 99,611.92 = 39,918.89 : x
2. Step 2: Convert to fraction form
   72,182.09/99,611.92 = 39,918.89/x
3. Step 3: Cross multiply
   72,182.09x = 99,611.92 × 39,918.89
4. Step 4: Simplify right side
   72,182.09x = 3,976,397,426.40
5. Step 5: Solve for x
   x = 3,976,397,426.40/72,182.09
6. Step 6: Final answer
   x = 55,088.43