Finding the Fourth Proportional to 1,160.50, 1,601.49 and 636.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.50 : 1,601.49 = 636.55 : x
2. Step 2: Convert to fraction form
   1,160.50/1,601.49 = 636.55/x
3. Step 3: Cross multiply
   1,160.50x = 1,601.49 × 636.55
4. Step 4: Simplify right side
   1,160.50x = 1,019,428.46
5. Step 5: Solve for x
   x = 1,019,428.46/1,160.50
6. Step 6: Final answer
   x = 878.44