Finding the Fourth Proportional to 1,080.61, 1,491.17 and 608.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.61 : 1,491.17 = 608.51 : x
2. Step 2: Convert to fraction form
   1,080.61/1,491.17 = 608.51/x
3. Step 3: Cross multiply
   1,080.61x = 1,491.17 × 608.51
4. Step 4: Simplify right side
   1,080.61x = 907,392.54
5. Step 5: Solve for x
   x = 907,392.54/1,080.61
6. Step 6: Final answer
   x = 839.71