Finding the Third Proportional to 878 and 1,112.25

Step by Step Solution

1. Step 1: Write the proportion equation
   878 : 1,112.25 = 1,112.25 : x
2. Step 2: Convert to fraction form
   878/1,112.25 = 1,112.25/x
3. Step 3: Cross multiply
   878x = 1,112.25 × 1,112.25
4. Step 4: Simplify right side
   878x = 1,237,100.06
5. Step 5: Solve for x
   x = 1,237,100.06/878
6. Step 6: Final answer
   x = 1,409.00