Finding the Fourth Proportional to 118,399.11, 163,391.34 and 64,685

Step by Step Solution

1. Step 1: Write the proportion equation
   118,399.11 : 163,391.34 = 64,685 : x
2. Step 2: Convert to fraction form
   118,399.11/163,391.34 = 64,685/x
3. Step 3: Cross multiply
   118,399.11x = 163,391.34 × 64,685
4. Step 4: Simplify right side
   118,399.11x = 10,568,968,827.90
5. Step 5: Solve for x
   x = 10,568,968,827.90/118,399.11
6. Step 6: Final answer
   x = 89,265.61