Finding the Fourth Proportional to 72,121.42, 99,527.31 and 39,855.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72,121.42 : 99,527.31 = 39,855.15 : x
2. Step 2: Convert to fraction form
   72,121.42/99,527.31 = 39,855.15/x
3. Step 3: Cross multiply
   72,121.42x = 99,527.31 × 39,855.15
4. Step 4: Simplify right side
   72,121.42x = 3,966,675,371.51
5. Step 5: Solve for x
   x = 3,966,675,371.51/72,121.42
6. Step 6: Final answer
   x = 54,999.96