Finding the Fourth Proportional to 1,080.17, 1,490.72 and 608.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.17 : 1,490.72 = 608.12 : x
2. Step 2: Convert to fraction form
   1,080.17/1,490.72 = 608.12/x
3. Step 3: Cross multiply
   1,080.17x = 1,490.72 × 608.12
4. Step 4: Simplify right side
   1,080.17x = 906,533.61
5. Step 5: Solve for x
   x = 906,533.61/1,080.17
6. Step 6: Final answer
   x = 839.25