Finding the Fourth Proportional to 65,143.52, 89,874.12 and 39,639.52

Step by Step Solution

1. Step 1: Write the proportion equation
   65,143.52 : 89,874.12 = 39,639.52 : x
2. Step 2: Convert to fraction form
   65,143.52/89,874.12 = 39,639.52/x
3. Step 3: Cross multiply
   65,143.52x = 89,874.12 × 39,639.52
4. Step 4: Simplify right side
   65,143.52x = 3,562,566,977.22
5. Step 5: Solve for x
   x = 3,562,566,977.22/65,143.52
6. Step 6: Final answer
   x = 54,687.97