Finding the Fourth Proportional to 5,640.55, 8,451.58 and 3,994.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,640.55 : 8,451.58 = 3,994.15 : x
2. Step 2: Convert to fraction form
   5,640.55/8,451.58 = 3,994.15/x
3. Step 3: Cross multiply
   5,640.55x = 8,451.58 × 3,994.15
4. Step 4: Simplify right side
   5,640.55x = 33,756,845.98
5. Step 5: Solve for x
   x = 33,756,845.98/5,640.55
6. Step 6: Final answer
   x = 5,984.67