Finding the Fourth Proportional to 65,109.50, 89,857.80 and 39,617.72

Step by Step Solution

1. Step 1: Write the proportion equation
   65,109.50 : 89,857.80 = 39,617.72 : x
2. Step 2: Convert to fraction form
   65,109.50/89,857.80 = 39,617.72/x
3. Step 3: Cross multiply
   65,109.50x = 89,857.80 × 39,617.72
4. Step 4: Simplify right side
   65,109.50x = 3,559,961,160.22
5. Step 5: Solve for x
   x = 3,559,961,160.22/65,109.50
6. Step 6: Final answer
   x = 54,676.52