Finding the Fourth Proportional to 8,082.78, 12,123.72 and 3,400.80

Step by Step Solution

1. Step 1: Write the proportion equation
   8,082.78 : 12,123.72 = 3,400.80 : x
2. Step 2: Convert to fraction form
   8,082.78/12,123.72 = 3,400.80/x
3. Step 3: Cross multiply
   8,082.78x = 12,123.72 × 3,400.80
4. Step 4: Simplify right side
   8,082.78x = 41,230,346.98
5. Step 5: Solve for x
   x = 41,230,346.98/8,082.78
6. Step 6: Final answer
   x = 5,101.01