Finding the Third Proportional to 12,988.69 and 20,243.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,988.69 : 20,243.25 = 20,243.25 : x
2. Step 2: Convert to fraction form
   12,988.69/20,243.25 = 20,243.25/x
3. Step 3: Cross multiply
   12,988.69x = 20,243.25 × 20,243.25
4. Step 4: Simplify right side
   12,988.69x = 409,789,170.56
5. Step 5: Solve for x
   x = 409,789,170.56/12,988.69
6. Step 6: Final answer
   x = 31,549.70