Finding the Fourth Proportional to 1,160.47, 1,601.45 and 636.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.47 : 1,601.45 = 636.50 : x
2. Step 2: Convert to fraction form
   1,160.47/1,601.45 = 636.50/x
3. Step 3: Cross multiply
   1,160.47x = 1,601.45 × 636.50
4. Step 4: Simplify right side
   1,160.47x = 1,019,321.33
5. Step 5: Solve for x
   x = 1,019,321.33/1,160.47
6. Step 6: Final answer
   x = 878.37