Finding the Third Proportional to 13,139.09 and 20,528.75

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.09 : 20,528.75 = 20,528.75 : x
2. Step 2: Convert to fraction form
   13,139.09/20,528.75 = 20,528.75/x
3. Step 3: Cross multiply
   13,139.09x = 20,528.75 × 20,528.75
4. Step 4: Simplify right side
   13,139.09x = 421,429,736.94
5. Step 5: Solve for x
   x = 421,429,736.94/13,139.09
6. Step 6: Final answer
   x = 32,074.51