Finding the Fourth Proportional to 1,155.25, 1,594.25 and 631.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.25 : 1,594.25 = 631.28 : x
2. Step 2: Convert to fraction form
   1,155.25/1,594.25 = 631.28/x
3. Step 3: Cross multiply
   1,155.25x = 1,594.25 × 631.28
4. Step 4: Simplify right side
   1,155.25x = 1,006,414.98
5. Step 5: Solve for x
   x = 1,006,414.98/1,155.25
6. Step 6: Final answer
   x = 871.17