Finding the Fourth Proportional to 1,120.43, 1,680.70 and 298.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.43 : 1,680.70 = 298.69 : x
2. Step 2: Convert to fraction form
   1,120.43/1,680.70 = 298.69/x
3. Step 3: Cross multiply
   1,120.43x = 1,680.70 × 298.69
4. Step 4: Simplify right side
   1,120.43x = 502,003.89
5. Step 5: Solve for x
   x = 502,003.89/1,120.43
6. Step 6: Final answer
   x = 448.04