Finding the Third Proportional to 11,351.81 and 12,399.75

Step by Step Solution

1. Step 1: Write the proportion equation
   11,351.81 : 12,399.75 = 12,399.75 : x
2. Step 2: Convert to fraction form
   11,351.81/12,399.75 = 12,399.75/x
3. Step 3: Cross multiply
   11,351.81x = 12,399.75 × 12,399.75
4. Step 4: Simplify right side
   11,351.81x = 153,753,800.06
5. Step 5: Solve for x
   x = 153,753,800.06/11,351.81
6. Step 6: Final answer
   x = 13,544.43