Finding the Fourth Proportional to 105,082.42, 145,014.22 and 57,336.78

Step by Step Solution

1. Step 1: Write the proportion equation
   105,082.42 : 145,014.22 = 57,336.78 : x
2. Step 2: Convert to fraction form
   105,082.42/145,014.22 = 57,336.78/x
3. Step 3: Cross multiply
   105,082.42x = 145,014.22 × 57,336.78
4. Step 4: Simplify right side
   105,082.42x = 8,314,648,429.01
5. Step 5: Solve for x
   x = 8,314,648,429.01/105,082.42
6. Step 6: Final answer
   x = 79,125.02