Finding the Fourth Proportional to 65,321.28, 90,149.76 and 39,825.72

Step by Step Solution

1. Step 1: Write the proportion equation
   65,321.28 : 90,149.76 = 39,825.72 : x
2. Step 2: Convert to fraction form
   65,321.28/90,149.76 = 39,825.72/x
3. Step 3: Cross multiply
   65,321.28x = 90,149.76 × 39,825.72
4. Step 4: Simplify right side
   65,321.28x = 3,590,279,099.83
5. Step 5: Solve for x
   x = 3,590,279,099.83/65,321.28
6. Step 6: Final answer
   x = 54,963.39