Finding the Fourth Proportional to 1,080.89, 1,491.62 and 608.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.89 : 1,491.62 = 608.79 : x
2. Step 2: Convert to fraction form
   1,080.89/1,491.62 = 608.79/x
3. Step 3: Cross multiply
   1,080.89x = 1,491.62 × 608.79
4. Step 4: Simplify right side
   1,080.89x = 908,085.89
5. Step 5: Solve for x
   x = 908,085.89/1,080.89
6. Step 6: Final answer
   x = 840.13