Finding the Fourth Proportional to 2,218.71, 3,061.78 and 1,224.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.71 : 3,061.78 = 1,224.02 : x
2. Step 2: Convert to fraction form
   2,218.71/3,061.78 = 1,224.02/x
3. Step 3: Cross multiply
   2,218.71x = 3,061.78 × 1,224.02
4. Step 4: Simplify right side
   2,218.71x = 3,747,679.96
5. Step 5: Solve for x
   x = 3,747,679.96/2,218.71
6. Step 6: Final answer
   x = 1,689.13