Finding the Fourth Proportional to 1,160.15, 1,601.01 and 636.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.15 : 1,601.01 = 636.21 : x
2. Step 2: Convert to fraction form
   1,160.15/1,601.01 = 636.21/x
3. Step 3: Cross multiply
   1,160.15x = 1,601.01 × 636.21
4. Step 4: Simplify right side
   1,160.15x = 1,018,578.57
5. Step 5: Solve for x
   x = 1,018,578.57/1,160.15
6. Step 6: Final answer
   x = 877.98