Finding the Fourth Proportional to 2,218.60, 3,061.74 and 1,223.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.60 : 3,061.74 = 1,223.98 : x
2. Step 2: Convert to fraction form
   2,218.60/3,061.74 = 1,223.98/x
3. Step 3: Cross multiply
   2,218.60x = 3,061.74 × 1,223.98
4. Step 4: Simplify right side
   2,218.60x = 3,747,508.53
5. Step 5: Solve for x
   x = 3,747,508.53/2,218.60
6. Step 6: Final answer
   x = 1,689.13