Finding the Third Proportional to 15,396 and 20,899.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,396 : 20,899.50 = 20,899.50 : x
2. Step 2: Convert to fraction form
   15,396/20,899.50 = 20,899.50/x
3. Step 3: Cross multiply
   15,396x = 20,899.50 × 20,899.50
4. Step 4: Simplify right side
   15,396x = 436,789,100.25
5. Step 5: Solve for x
   x = 436,789,100.25/15,396
6. Step 6: Final answer
   x = 28,370.30