Finding the Fourth Proportional to 2,218.38, 3,061.32 and 1,223.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.38 : 3,061.32 = 1,223.64 : x
2. Step 2: Convert to fraction form
   2,218.38/3,061.32 = 1,223.64/x
3. Step 3: Cross multiply
   2,218.38x = 3,061.32 × 1,223.64
4. Step 4: Simplify right side
   2,218.38x = 3,745,953.60
5. Step 5: Solve for x
   x = 3,745,953.60/2,218.38
6. Step 6: Final answer
   x = 1,688.60