Finding the Fourth Proportional to 72,339.28, 99,721.73 and 50,760.88

Step by Step Solution

1. Step 1: Write the proportion equation
   72,339.28 : 99,721.73 = 50,760.88 : x
2. Step 2: Convert to fraction form
   72,339.28/99,721.73 = 50,760.88/x
3. Step 3: Cross multiply
   72,339.28x = 99,721.73 × 50,760.88
4. Step 4: Simplify right side
   72,339.28x = 5,061,962,647.52
5. Step 5: Solve for x
   x = 5,061,962,647.52/72,339.28
6. Step 6: Final answer
   x = 69,975.30