Finding the Fourth Proportional to 8,380.70, 12,579.15 and 5,100.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,380.70 : 12,579.15 = 5,100.20 : x
2. Step 2: Convert to fraction form
   8,380.70/12,579.15 = 5,100.20/x
3. Step 3: Cross multiply
   8,380.70x = 12,579.15 × 5,100.20
4. Step 4: Simplify right side
   8,380.70x = 64,156,180.83
5. Step 5: Solve for x
   x = 64,156,180.83/8,380.70
6. Step 6: Final answer
   x = 7,655.23