Finding the Fourth Proportional to 1,223.18, 1,688.31 and 757.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223.18 : 1,688.31 = 757.82 : x
2. Step 2: Convert to fraction form
   1,223.18/1,688.31 = 757.82/x
3. Step 3: Cross multiply
   1,223.18x = 1,688.31 × 757.82
4. Step 4: Simplify right side
   1,223.18x = 1,279,435.08
5. Step 5: Solve for x
   x = 1,279,435.08/1,223.18
6. Step 6: Final answer
   x = 1,045.99