Finding the Fourth Proportional to 1,968.47, 2,716.31 and 1,222.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,968.47 : 2,716.31 = 1,222.62 : x
2. Step 2: Convert to fraction form
   1,968.47/2,716.31 = 1,222.62/x
3. Step 3: Cross multiply
   1,968.47x = 2,716.31 × 1,222.62
4. Step 4: Simplify right side
   1,968.47x = 3,321,008.82
5. Step 5: Solve for x
   x = 3,321,008.82/1,968.47
6. Step 6: Final answer
   x = 1,687.11