Finding the Fourth Proportional to 1,119.94, 1,680.12 and 426.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,119.94 : 1,680.12 = 426.82 : x
2. Step 2: Convert to fraction form
   1,119.94/1,680.12 = 426.82/x
3. Step 3: Cross multiply
   1,119.94x = 1,680.12 × 426.82
4. Step 4: Simplify right side
   1,119.94x = 717,108.82
5. Step 5: Solve for x
   x = 717,108.82/1,119.94
6. Step 6: Final answer
   x = 640.31