Finding the Fourth Proportional to 1,969.72, 2,718.72 and 1,223.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,969.72 : 2,718.72 = 1,223.24 : x
2. Step 2: Convert to fraction form
   1,969.72/2,718.72 = 1,223.24/x
3. Step 3: Cross multiply
   1,969.72x = 2,718.72 × 1,223.24
4. Step 4: Simplify right side
   1,969.72x = 3,325,647.05
5. Step 5: Solve for x
   x = 3,325,647.05/1,969.72
6. Step 6: Final answer
   x = 1,688.39