Finding the Fourth Proportional to 2,245.86, 3,369.21 and 685.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,245.86 : 3,369.21 = 685.69 : x
2. Step 2: Convert to fraction form
   2,245.86/3,369.21 = 685.69/x
3. Step 3: Cross multiply
   2,245.86x = 3,369.21 × 685.69
4. Step 4: Simplify right side
   2,245.86x = 2,310,222.61
5. Step 5: Solve for x
   x = 2,310,222.61/2,245.86
6. Step 6: Final answer
   x = 1,028.66