Finding the Third Proportional to 21,240 and 31,108.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,240 : 31,108.50 = 31,108.50 : x
2. Step 2: Convert to fraction form
   21,240/31,108.50 = 31,108.50/x
3. Step 3: Cross multiply
   21,240x = 31,108.50 × 31,108.50
4. Step 4: Simplify right side
   21,240x = 967,738,772.25
5. Step 5: Solve for x
   x = 967,738,772.25/21,240
6. Step 6: Final answer
   x = 45,562.09