Finding the Fourth Proportional to 2,218.37, 3,061.30 and 1,223.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.37 : 3,061.30 = 1,223.62 : x
2. Step 2: Convert to fraction form
   2,218.37/3,061.30 = 1,223.62/x
3. Step 3: Cross multiply
   2,218.37x = 3,061.30 × 1,223.62
4. Step 4: Simplify right side
   2,218.37x = 3,745,867.91
5. Step 5: Solve for x
   x = 3,745,867.91/2,218.37
6. Step 6: Final answer
   x = 1,688.57