Finding the Third Proportional to 13,620 and 31,388

Step by Step Solution

1. Step 1: Write the proportion equation
   13,620 : 31,388 = 31,388 : x
2. Step 2: Convert to fraction form
   13,620/31,388 = 31,388/x
3. Step 3: Cross multiply
   13,620x = 31,388 × 31,388
4. Step 4: Simplify right side
   13,620x = 985,206,544
5. Step 5: Solve for x
   x = 985,206,544/13,620
6. Step 6: Final answer
   x = 72,335.28