Finding the Fourth Proportional to 3,990.38, 5,508.70 and 3,092.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.38 : 5,508.70 = 3,092.10 : x
2. Step 2: Convert to fraction form
   3,990.38/5,508.70 = 3,092.10/x
3. Step 3: Cross multiply
   3,990.38x = 5,508.70 × 3,092.10
4. Step 4: Simplify right side
   3,990.38x = 17,033,451.27
5. Step 5: Solve for x
   x = 17,033,451.27/3,990.38
6. Step 6: Final answer
   x = 4,268.63