Finding the Fourth Proportional to 105,480.53, 145,562.60 and 57,082.42

Step by Step Solution

1. Step 1: Write the proportion equation
   105,480.53 : 145,562.60 = 57,082.42 : x
2. Step 2: Convert to fraction form
   105,480.53/145,562.60 = 57,082.42/x
3. Step 3: Cross multiply
   105,480.53x = 145,562.60 × 57,082.42
4. Step 4: Simplify right side
   105,480.53x = 8,309,065,469.49
5. Step 5: Solve for x
   x = 8,309,065,469.49/105,480.53
6. Step 6: Final answer
   x = 78,773.45