Finding the Fourth Proportional to 1,160.15, 1,601.02 and 636.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.15 : 1,601.02 = 636.17 : x
2. Step 2: Convert to fraction form
   1,160.15/1,601.02 = 636.17/x
3. Step 3: Cross multiply
   1,160.15x = 1,601.02 × 636.17
4. Step 4: Simplify right side
   1,160.15x = 1,018,520.89
5. Step 5: Solve for x
   x = 1,018,520.89/1,160.15
6. Step 6: Final answer
   x = 877.93