Finding the Fourth Proportional to 1,078.59, 1,488.24 and 636.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.59 : 1,488.24 = 636.42 : x
2. Step 2: Convert to fraction form
   1,078.59/1,488.24 = 636.42/x
3. Step 3: Cross multiply
   1,078.59x = 1,488.24 × 636.42
4. Step 4: Simplify right side
   1,078.59x = 947,145.70
5. Step 5: Solve for x
   x = 947,145.70/1,078.59
6. Step 6: Final answer
   x = 878.13