Finding the Fourth Proportional to 2,218.32, 3,061.30 and 1,223.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.32 : 3,061.30 = 1,223.59 : x
2. Step 2: Convert to fraction form
   2,218.32/3,061.30 = 1,223.59/x
3. Step 3: Cross multiply
   2,218.32x = 3,061.30 × 1,223.59
4. Step 4: Simplify right side
   2,218.32x = 3,745,760.76
5. Step 5: Solve for x
   x = 3,745,760.76/2,218.32
6. Step 6: Final answer
   x = 1,688.56