Finding the Fourth Proportional to 1,160.58, 1,601.62 and 636.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.58 : 1,601.62 = 636.61 : x
2. Step 2: Convert to fraction form
   1,160.58/1,601.62 = 636.61/x
3. Step 3: Cross multiply
   1,160.58x = 1,601.62 × 636.61
4. Step 4: Simplify right side
   1,160.58x = 1,019,608.30
5. Step 5: Solve for x
   x = 1,019,608.30/1,160.58
6. Step 6: Final answer
   x = 878.53