Finding the Fourth Proportional to 2,208.50, 3,309.91 and 1,686.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,208.50 : 3,309.91 = 1,686.58 : x
2. Step 2: Convert to fraction form
   2,208.50/3,309.91 = 1,686.58/x
3. Step 3: Cross multiply
   2,208.50x = 3,309.91 × 1,686.58
4. Step 4: Simplify right side
   2,208.50x = 5,582,428.01
5. Step 5: Solve for x
   x = 5,582,428.01/2,208.50
6. Step 6: Final answer
   x = 2,527.70