Finding the Fourth Proportional to 2,218.24, 3,061.35 and 1,223.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.24 : 3,061.35 = 1,223.61 : x
2. Step 2: Convert to fraction form
   2,218.24/3,061.35 = 1,223.61/x
3. Step 3: Cross multiply
   2,218.24x = 3,061.35 × 1,223.61
4. Step 4: Simplify right side
   2,218.24x = 3,745,898.47
5. Step 5: Solve for x
   x = 3,745,898.47/2,218.24
6. Step 6: Final answer
   x = 1,688.68