Finding the Fourth Proportional to 2,218.77, 3,061.68 and 1,223.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.77 : 3,061.68 = 1,223.79 : x
2. Step 2: Convert to fraction form
   2,218.77/3,061.68 = 1,223.79/x
3. Step 3: Cross multiply
   2,218.77x = 3,061.68 × 1,223.79
4. Step 4: Simplify right side
   2,218.77x = 3,746,853.37
5. Step 5: Solve for x
   x = 3,746,853.37/2,218.77
6. Step 6: Final answer
   x = 1,688.71