Finding the Fourth Proportional to 1,160.80, 1,601.90 and 636.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.80 : 1,601.90 = 636.83 : x
2. Step 2: Convert to fraction form
   1,160.80/1,601.90 = 636.83/x
3. Step 3: Cross multiply
   1,160.80x = 1,601.90 × 636.83
4. Step 4: Simplify right side
   1,160.80x = 1,020,137.98
5. Step 5: Solve for x
   x = 1,020,137.98/1,160.80
6. Step 6: Final answer
   x = 878.82