Finding the Fourth Proportional to 1,081.74, 1,621.58 and 350.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.74 : 1,621.58 = 350.86 : x
2. Step 2: Convert to fraction form
   1,081.74/1,621.58 = 350.86/x
3. Step 3: Cross multiply
   1,081.74x = 1,621.58 × 350.86
4. Step 4: Simplify right side
   1,081.74x = 568,947.56
5. Step 5: Solve for x
   x = 568,947.56/1,081.74
6. Step 6: Final answer
   x = 525.96