Finding the Fourth Proportional to 8,078.56, 12,123.42 and 5,306.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,078.56 : 12,123.42 = 5,306.56 : x
2. Step 2: Convert to fraction form
   8,078.56/12,123.42 = 5,306.56/x
3. Step 3: Cross multiply
   8,078.56x = 12,123.42 × 5,306.56
4. Step 4: Simplify right side
   8,078.56x = 64,333,655.64
5. Step 5: Solve for x
   x = 64,333,655.64/8,078.56
6. Step 6: Final answer
   x = 7,963.51