Finding the Fourth Proportional to 1,131.07, 1,695.49 and 636.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.07 : 1,695.49 = 636.91 : x
2. Step 2: Convert to fraction form
   1,131.07/1,695.49 = 636.91/x
3. Step 3: Cross multiply
   1,131.07x = 1,695.49 × 636.91
4. Step 4: Simplify right side
   1,131.07x = 1,079,874.54
5. Step 5: Solve for x
   x = 1,079,874.54/1,131.07
6. Step 6: Final answer
   x = 954.74