Finding the Fourth Proportional to 6,674.78, 9,210.72 and 3,690.20

Step by Step Solution

1. Step 1: Write the proportion equation
   6,674.78 : 9,210.72 = 3,690.20 : x
2. Step 2: Convert to fraction form
   6,674.78/9,210.72 = 3,690.20/x
3. Step 3: Cross multiply
   6,674.78x = 9,210.72 × 3,690.20
4. Step 4: Simplify right side
   6,674.78x = 33,989,352.89
5. Step 5: Solve for x
   x = 33,989,352.89/6,674.78
6. Step 6: Final answer
   x = 5,092.21