Finding the Fourth Proportional to 8,300.64, 12,442.56 and 5,380.80

Step by Step Solution

1. Step 1: Write the proportion equation
   8,300.64 : 12,442.56 = 5,380.80 : x
2. Step 2: Convert to fraction form
   8,300.64/12,442.56 = 5,380.80/x
3. Step 3: Cross multiply
   8,300.64x = 12,442.56 × 5,380.80
4. Step 4: Simplify right side
   8,300.64x = 66,950,926.85
5. Step 5: Solve for x
   x = 66,950,926.85/8,300.64
6. Step 6: Final answer
   x = 8,065.75