Finding the Fourth Proportional to 2,218.79, 3,061.94 and 1,224.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.79 : 3,061.94 = 1,224.11 : x
2. Step 2: Convert to fraction form
   2,218.79/3,061.94 = 1,224.11/x
3. Step 3: Cross multiply
   2,218.79x = 3,061.94 × 1,224.11
4. Step 4: Simplify right side
   2,218.79x = 3,748,152.91
5. Step 5: Solve for x
   x = 3,748,152.91/2,218.79
6. Step 6: Final answer
   x = 1,689.28