Finding the Fourth Proportional to 1,079.74, 1,490.06 and 660.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.74 : 1,490.06 = 660.04 : x
2. Step 2: Convert to fraction form
   1,079.74/1,490.06 = 660.04/x
3. Step 3: Cross multiply
   1,079.74x = 1,490.06 × 660.04
4. Step 4: Simplify right side
   1,079.74x = 983,499.20
5. Step 5: Solve for x
   x = 983,499.20/1,079.74
6. Step 6: Final answer
   x = 910.87