Finding the Fourth Proportional to 1,329.92, 1,994.17 and 636.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,329.92 : 1,994.17 = 636.15 : x
2. Step 2: Convert to fraction form
   1,329.92/1,994.17 = 636.15/x
3. Step 3: Cross multiply
   1,329.92x = 1,994.17 × 636.15
4. Step 4: Simplify right side
   1,329.92x = 1,268,598.33
5. Step 5: Solve for x
   x = 1,268,598.33/1,329.92
6. Step 6: Final answer
   x = 953.89