Finding the Fourth Proportional to 1,080.42, 1,619.72 and 531.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.42 : 1,619.72 = 531.86 : x
2. Step 2: Convert to fraction form
   1,080.42/1,619.72 = 531.86/x
3. Step 3: Cross multiply
   1,080.42x = 1,619.72 × 531.86
4. Step 4: Simplify right side
   1,080.42x = 861,453.52
5. Step 5: Solve for x
   x = 861,453.52/1,080.42
6. Step 6: Final answer
   x = 797.33