Finding the Fourth Proportional to 1,150.17, 1,587.12 and 645.97

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.17 : 1,587.12 = 645.97 : x
2. Step 2: Convert to fraction form
   1,150.17/1,587.12 = 645.97/x
3. Step 3: Cross multiply
   1,150.17x = 1,587.12 × 645.97
4. Step 4: Simplify right side
   1,150.17x = 1,025,231.91
5. Step 5: Solve for x
   x = 1,025,231.91/1,150.17
6. Step 6: Final answer
   x = 891.37