Finding the Third Proportional to 13,638.38 and 21,130.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,638.38 : 21,130.88 = 21,130.88 : x
2. Step 2: Convert to fraction form
   13,638.38/21,130.88 = 21,130.88/x
3. Step 3: Cross multiply
   13,638.38x = 21,130.88 × 21,130.88
4. Step 4: Simplify right side
   13,638.38x = 446,513,878.27
5. Step 5: Solve for x
   x = 446,513,878.27/13,638.38
6. Step 6: Final answer
   x = 32,739.52