Finding the Fourth Proportional to 1,329.83, 1,991.71 and 636.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,329.83 : 1,991.71 = 636.98 : x
2. Step 2: Convert to fraction form
   1,329.83/1,991.71 = 636.98/x
3. Step 3: Cross multiply
   1,329.83x = 1,991.71 × 636.98
4. Step 4: Simplify right side
   1,329.83x = 1,268,682.82
5. Step 5: Solve for x
   x = 1,268,682.82/1,329.83
6. Step 6: Final answer
   x = 954.02