Finding the Fourth Proportional to 80,205.12, 120,270.56 and 45,144.77

Step by Step Solution

1. Step 1: Write the proportion equation
   80,205.12 : 120,270.56 = 45,144.77 : x
2. Step 2: Convert to fraction form
   80,205.12/120,270.56 = 45,144.77/x
3. Step 3: Cross multiply
   80,205.12x = 120,270.56 × 45,144.77
4. Step 4: Simplify right side
   80,205.12x = 5,429,585,941.89
5. Step 5: Solve for x
   x = 5,429,585,941.89/80,205.12
6. Step 6: Final answer
   x = 67,696.25