Finding the Fourth Proportional to 1,160.55, 1,601.55 and 636.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.55 : 1,601.55 = 636.58 : x
2. Step 2: Convert to fraction form
   1,160.55/1,601.55 = 636.58/x
3. Step 3: Cross multiply
   1,160.55x = 1,601.55 × 636.58
4. Step 4: Simplify right side
   1,160.55x = 1,019,514.70
5. Step 5: Solve for x
   x = 1,019,514.70/1,160.55
6. Step 6: Final answer
   x = 878.48