Finding the Third Proportional to 12,888 and 20,722.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,888 : 20,722.50 = 20,722.50 : x
2. Step 2: Convert to fraction form
   12,888/20,722.50 = 20,722.50/x
3. Step 3: Cross multiply
   12,888x = 20,722.50 × 20,722.50
4. Step 4: Simplify right side
   12,888x = 429,422,006.25
5. Step 5: Solve for x
   x = 429,422,006.25/12,888
6. Step 6: Final answer
   x = 33,319.52