Finding the Fourth Proportional to 1,222.34, 1,687.59 and 757.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.34 : 1,687.59 = 757.40 : x
2. Step 2: Convert to fraction form
   1,222.34/1,687.59 = 757.40/x
3. Step 3: Cross multiply
   1,222.34x = 1,687.59 × 757.40
4. Step 4: Simplify right side
   1,222.34x = 1,278,172.23
5. Step 5: Solve for x
   x = 1,278,172.23/1,222.34
6. Step 6: Final answer
   x = 1,045.68