Finding the Fourth Proportional to 1,080.82, 1,491.59 and 615.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.82 : 1,491.59 = 615.07 : x
2. Step 2: Convert to fraction form
   1,080.82/1,491.59 = 615.07/x
3. Step 3: Cross multiply
   1,080.82x = 1,491.59 × 615.07
4. Step 4: Simplify right side
   1,080.82x = 917,432.26
5. Step 5: Solve for x
   x = 917,432.26/1,080.82
6. Step 6: Final answer
   x = 848.83