Finding the Fourth Proportional to 1,079.25, 1,488.58 and 636.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.25 : 1,488.58 = 636.83 : x
2. Step 2: Convert to fraction form
   1,079.25/1,488.58 = 636.83/x
3. Step 3: Cross multiply
   1,079.25x = 1,488.58 × 636.83
4. Step 4: Simplify right side
   1,079.25x = 947,968.95
5. Step 5: Solve for x
   x = 947,968.95/1,079.25
6. Step 6: Final answer
   x = 878.36