Finding the Third Proportional to 12,788 and 20,358

Step by Step Solution

1. Step 1: Write the proportion equation
   12,788 : 20,358 = 20,358 : x
2. Step 2: Convert to fraction form
   12,788/20,358 = 20,358/x
3. Step 3: Cross multiply
   12,788x = 20,358 × 20,358
4. Step 4: Simplify right side
   12,788x = 414,448,164
5. Step 5: Solve for x
   x = 414,448,164/12,788
6. Step 6: Final answer
   x = 32,409.15