Finding the Fourth Proportional to 72,013.77, 99,371.46 and 39,747.79

Step by Step Solution

1. Step 1: Write the proportion equation
   72,013.77 : 99,371.46 = 39,747.79 : x
2. Step 2: Convert to fraction form
   72,013.77/99,371.46 = 39,747.79/x
3. Step 3: Cross multiply
   72,013.77x = 99,371.46 × 39,747.79
4. Step 4: Simplify right side
   72,013.77x = 3,949,795,924.07
5. Step 5: Solve for x
   x = 3,949,795,924.07/72,013.77
6. Step 6: Final answer
   x = 54,847.79