Finding the Fourth Proportional to 1,081.31, 1,621.62 and 350.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.31 : 1,621.62 = 350.73 : x
2. Step 2: Convert to fraction form
   1,081.31/1,621.62 = 350.73/x
3. Step 3: Cross multiply
   1,081.31x = 1,621.62 × 350.73
4. Step 4: Simplify right side
   1,081.31x = 568,750.78
5. Step 5: Solve for x
   x = 568,750.78/1,081.31
6. Step 6: Final answer
   x = 525.99