Finding the Fourth Proportional to 3,990.57, 5,517.54 and 3,498.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.57 : 5,517.54 = 3,498.45 : x
2. Step 2: Convert to fraction form
   3,990.57/5,517.54 = 3,498.45/x
3. Step 3: Cross multiply
   3,990.57x = 5,517.54 × 3,498.45
4. Step 4: Simplify right side
   3,990.57x = 19,302,837.81
5. Step 5: Solve for x
   x = 19,302,837.81/3,990.57
6. Step 6: Final answer
   x = 4,837.11