Finding the Fourth Proportional to 2,499.90, 3,451.17 and 1,616.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.90 : 3,451.17 = 1,616.21 : x
2. Step 2: Convert to fraction form
   2,499.90/3,451.17 = 1,616.21/x
3. Step 3: Cross multiply
   2,499.90x = 3,451.17 × 1,616.21
4. Step 4: Simplify right side
   2,499.90x = 5,577,798.21
5. Step 5: Solve for x
   x = 5,577,798.21/2,499.90
6. Step 6: Final answer
   x = 2,231.21