Finding the Fourth Proportional to 1,080.71, 1,491.32 and 608.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.71 : 1,491.32 = 608.63 : x
2. Step 2: Convert to fraction form
   1,080.71/1,491.32 = 608.63/x
3. Step 3: Cross multiply
   1,080.71x = 1,491.32 × 608.63
4. Step 4: Simplify right side
   1,080.71x = 907,651.59
5. Step 5: Solve for x
   x = 907,651.59/1,080.71
6. Step 6: Final answer
   x = 839.87