Finding the Fourth Proportional to 5,399.76, 8,100.78 and 2,279.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,399.76 : 8,100.78 = 2,279.78 : x
2. Step 2: Convert to fraction form
   5,399.76/8,100.78 = 2,279.78/x
3. Step 3: Cross multiply
   5,399.76x = 8,100.78 × 2,279.78
4. Step 4: Simplify right side
   5,399.76x = 18,467,977.55
5. Step 5: Solve for x
   x = 18,467,977.55/5,399.76
6. Step 6: Final answer
   x = 3,420.15