Finding the Third Proportional to 21,357 and 31,917.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,357 : 31,917.38 = 31,917.38 : x
2. Step 2: Convert to fraction form
   21,357/31,917.38 = 31,917.38/x
3. Step 3: Cross multiply
   21,357x = 31,917.38 × 31,917.38
4. Step 4: Simplify right side
   21,357x = 1,018,718,826.89
5. Step 5: Solve for x
   x = 1,018,718,826.89/21,357
6. Step 6: Final answer
   x = 47,699.53