Finding the Fourth Proportional to 2,245.50, 3,368.38 and 685.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,245.50 : 3,368.38 = 685.61 : x
2. Step 2: Convert to fraction form
   2,245.50/3,368.38 = 685.61/x
3. Step 3: Cross multiply
   2,245.50x = 3,368.38 × 685.61
4. Step 4: Simplify right side
   2,245.50x = 2,309,395.01
5. Step 5: Solve for x
   x = 2,309,395.01/2,245.50
6. Step 6: Final answer
   x = 1,028.45