Finding the Fourth Proportional to 65,291.09, 89,872.19 and 57,205.68

Step by Step Solution

1. Step 1: Write the proportion equation
   65,291.09 : 89,872.19 = 57,205.68 : x
2. Step 2: Convert to fraction form
   65,291.09/89,872.19 = 57,205.68/x
3. Step 3: Cross multiply
   65,291.09x = 89,872.19 × 57,205.68
4. Step 4: Simplify right side
   65,291.09x = 5,141,200,222.07
5. Step 5: Solve for x
   x = 5,141,200,222.07/65,291.09
6. Step 6: Final answer
   x = 78,742.75