Finding the Fourth Proportional to 1,160.72, 1,601.79 and 636.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.72 : 1,601.79 = 636.76 : x
2. Step 2: Convert to fraction form
   1,160.72/1,601.79 = 636.76/x
3. Step 3: Cross multiply
   1,160.72x = 1,601.79 × 636.76
4. Step 4: Simplify right side
   1,160.72x = 1,019,959.00
5. Step 5: Solve for x
   x = 1,019,959.00/1,160.72
6. Step 6: Final answer
   x = 878.73