Finding the Third Proportional to 423 and 1,118.25

Step by Step Solution

1. Step 1: Write the proportion equation
   423 : 1,118.25 = 1,118.25 : x
2. Step 2: Convert to fraction form
   423/1,118.25 = 1,118.25/x
3. Step 3: Cross multiply
   423x = 1,118.25 × 1,118.25
4. Step 4: Simplify right side
   423x = 1,250,483.06
5. Step 5: Solve for x
   x = 1,250,483.06/423
6. Step 6: Final answer
   x = 2,956.22