Finding the Fourth Proportional to 1,081.91, 1,622.52 and 351.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.91 : 1,622.52 = 351.31 : x
2. Step 2: Convert to fraction form
   1,081.91/1,622.52 = 351.31/x
3. Step 3: Cross multiply
   1,081.91x = 1,622.52 × 351.31
4. Step 4: Simplify right side
   1,081.91x = 570,007.50
5. Step 5: Solve for x
   x = 570,007.50/1,081.91
6. Step 6: Final answer
   x = 526.85