Finding the Third Proportional to 21,021.40 and 31,620.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,021.40 : 31,620.38 = 31,620.38 : x
2. Step 2: Convert to fraction form
   21,021.40/31,620.38 = 31,620.38/x
3. Step 3: Cross multiply
   21,021.40x = 31,620.38 × 31,620.38
4. Step 4: Simplify right side
   21,021.40x = 999,848,115.14
5. Step 5: Solve for x
   x = 999,848,115.14/21,021.40
6. Step 6: Final answer
   x = 47,563.35