Finding the Third Proportional to 864.98 and 1,143.69

Step by Step Solution

1. Step 1: Write the proportion equation
   864.98 : 1,143.69 = 1,143.69 : x
2. Step 2: Convert to fraction form
   864.98/1,143.69 = 1,143.69/x
3. Step 3: Cross multiply
   864.98x = 1,143.69 × 1,143.69
4. Step 4: Simplify right side
   864.98x = 1,308,026.68
5. Step 5: Solve for x
   x = 1,308,026.68/864.98
6. Step 6: Final answer
   x = 1,512.21