Finding the Fourth Proportional to 1,120.38, 1,680.56 and 350.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.38 : 1,680.56 = 350.88 : x
2. Step 2: Convert to fraction form
   1,120.38/1,680.56 = 350.88/x
3. Step 3: Cross multiply
   1,120.38x = 1,680.56 × 350.88
4. Step 4: Simplify right side
   1,120.38x = 589,667.37
5. Step 5: Solve for x
   x = 589,667.37/1,120.38
6. Step 6: Final answer
   x = 526.31