Finding the Fourth Proportional to 1,160.52, 1,601.55 and 636.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.52 : 1,601.55 = 636.59 : x
2. Step 2: Convert to fraction form
   1,160.52/1,601.55 = 636.59/x
3. Step 3: Cross multiply
   1,160.52x = 1,601.55 × 636.59
4. Step 4: Simplify right side
   1,160.52x = 1,019,522.71
5. Step 5: Solve for x
   x = 1,019,522.71/1,160.52
6. Step 6: Final answer
   x = 878.51