Finding the Fourth Proportional to 65,107.50, 89,855.04 and 39,615.72

Step by Step Solution

1. Step 1: Write the proportion equation
   65,107.50 : 89,855.04 = 39,615.72 : x
2. Step 2: Convert to fraction form
   65,107.50/89,855.04 = 39,615.72/x
3. Step 3: Cross multiply
   65,107.50x = 89,855.04 × 39,615.72
4. Step 4: Simplify right side
   65,107.50x = 3,559,672,105.23
5. Step 5: Solve for x
   x = 3,559,672,105.23/65,107.50
6. Step 6: Final answer
   x = 54,673.76