Finding the Fourth Proportional to 1,079.08, 1,488.72 and 636.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.08 : 1,488.72 = 636.82 : x
2. Step 2: Convert to fraction form
   1,079.08/1,488.72 = 636.82/x
3. Step 3: Cross multiply
   1,079.08x = 1,488.72 × 636.82
4. Step 4: Simplify right side
   1,079.08x = 948,046.67
5. Step 5: Solve for x
   x = 948,046.67/1,079.08
6. Step 6: Final answer
   x = 878.57