Finding the Fourth Proportional to 1,080.98, 1,491.72 and 608.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.98 : 1,491.72 = 608.90 : x
2. Step 2: Convert to fraction form
   1,080.98/1,491.72 = 608.90/x
3. Step 3: Cross multiply
   1,080.98x = 1,491.72 × 608.90
4. Step 4: Simplify right side
   1,080.98x = 908,308.31
5. Step 5: Solve for x
   x = 908,308.31/1,080.98
6. Step 6: Final answer
   x = 840.26