Finding the Fourth Proportional to 1,968.72, 2,716.98 and 1,223.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,968.72 : 2,716.98 = 1,223.22 : x
2. Step 2: Convert to fraction form
   1,968.72/2,716.98 = 1,223.22/x
3. Step 3: Cross multiply
   1,968.72x = 2,716.98 × 1,223.22
4. Step 4: Simplify right side
   1,968.72x = 3,323,464.28
5. Step 5: Solve for x
   x = 3,323,464.28/1,968.72
6. Step 6: Final answer
   x = 1,688.13