Finding the Fourth Proportional to 1,968.55, 2,716.88 and 1,223.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,968.55 : 2,716.88 = 1,223.31 : x
2. Step 2: Convert to fraction form
   1,968.55/2,716.88 = 1,223.31/x
3. Step 3: Cross multiply
   1,968.55x = 2,716.88 × 1,223.31
4. Step 4: Simplify right side
   1,968.55x = 3,323,590.54
5. Step 5: Solve for x
   x = 3,323,590.54/1,968.55
6. Step 6: Final answer
   x = 1,688.35