Finding the Fourth Proportional to 65,013.87, 89,725.51 and 39,518.31

Step by Step Solution

1. Step 1: Write the proportion equation
   65,013.87 : 89,725.51 = 39,518.31 : x
2. Step 2: Convert to fraction form
   65,013.87/89,725.51 = 39,518.31/x
3. Step 3: Cross multiply
   65,013.87x = 89,725.51 × 39,518.31
4. Step 4: Simplify right side
   65,013.87x = 3,545,800,321.50
5. Step 5: Solve for x
   x = 3,545,800,321.50/65,013.87
6. Step 6: Final answer
   x = 54,539.14