Finding the Fourth Proportional to 5,397.40, 8,086.78 and 4,213.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,397.40 : 8,086.78 = 4,213.78 : x
2. Step 2: Convert to fraction form
   5,397.40/8,086.78 = 4,213.78/x
3. Step 3: Cross multiply
   5,397.40x = 8,086.78 × 4,213.78
4. Step 4: Simplify right side
   5,397.40x = 34,075,911.83
5. Step 5: Solve for x
   x = 34,075,911.83/5,397.40
6. Step 6: Final answer
   x = 6,313.39