Finding the Fourth Proportional to 118,105.80, 162,986.98 and 64,391.20

Step by Step Solution

1. Step 1: Write the proportion equation
   118,105.80 : 162,986.98 = 64,391.20 : x
2. Step 2: Convert to fraction form
   118,105.80/162,986.98 = 64,391.20/x
3. Step 3: Cross multiply
   118,105.80x = 162,986.98 × 64,391.20
4. Step 4: Simplify right side
   118,105.80x = 10,494,927,226.58
5. Step 5: Solve for x
   x = 10,494,927,226.58/118,105.80
6. Step 6: Final answer
   x = 88,860.39