Finding the Fourth Proportional to 262,648.42, 394,035 and 85,155.55

Step by Step Solution

1. Step 1: Write the proportion equation
   262,648.42 : 394,035 = 85,155.55 : x
2. Step 2: Convert to fraction form
   262,648.42/394,035 = 85,155.55/x
3. Step 3: Cross multiply
   262,648.42x = 394,035 × 85,155.55
4. Step 4: Simplify right side
   262,648.42x = 33,554,267,144.25
5. Step 5: Solve for x
   x = 33,554,267,144.25/262,648.42
6. Step 6: Final answer
   x = 127,753.55