Finding the Third Proportional to 11,920.50 and 17,421.75

Step by Step Solution

1. Step 1: Write the proportion equation
   11,920.50 : 17,421.75 = 17,421.75 : x
2. Step 2: Convert to fraction form
   11,920.50/17,421.75 = 17,421.75/x
3. Step 3: Cross multiply
   11,920.50x = 17,421.75 × 17,421.75
4. Step 4: Simplify right side
   11,920.50x = 303,517,373.06
5. Step 5: Solve for x
   x = 303,517,373.06/11,920.50
6. Step 6: Final answer
   x = 25,461.80