Finding the Fourth Proportional to 65,131.12, 89,894.98 and 39,645.68

Step by Step Solution

1. Step 1: Write the proportion equation
   65,131.12 : 89,894.98 = 39,645.68 : x
2. Step 2: Convert to fraction form
   65,131.12/89,894.98 = 39,645.68/x
3. Step 3: Cross multiply
   65,131.12x = 89,894.98 × 39,645.68
4. Step 4: Simplify right side
   65,131.12x = 3,563,947,610.69
5. Step 5: Solve for x
   x = 3,563,947,610.69/65,131.12
6. Step 6: Final answer
   x = 54,719.58