Finding the Third Proportional to 8,638.88 and 13,536.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,638.88 : 13,536.56 = 13,536.56 : x
2. Step 2: Convert to fraction form
   8,638.88/13,536.56 = 13,536.56/x
3. Step 3: Cross multiply
   8,638.88x = 13,536.56 × 13,536.56
4. Step 4: Simplify right side
   8,638.88x = 183,238,524.32
5. Step 5: Solve for x
   x = 183,238,524.32/8,638.88
6. Step 6: Final answer
   x = 21,210.92