Finding the Fourth Proportional to 1,160.67, 1,601.75 and 636.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.67 : 1,601.75 = 636.71 : x
2. Step 2: Convert to fraction form
   1,160.67/1,601.75 = 636.71/x
3. Step 3: Cross multiply
   1,160.67x = 1,601.75 × 636.71
4. Step 4: Simplify right side
   1,160.67x = 1,019,839.05
5. Step 5: Solve for x
   x = 1,019,839.05/1,160.67
6. Step 6: Final answer
   x = 878.66