Finding the Third Proportional to 21,640.50 and 34,239

Step by Step Solution

1. Step 1: Write the proportion equation
   21,640.50 : 34,239 = 34,239 : x
2. Step 2: Convert to fraction form
   21,640.50/34,239 = 34,239/x
3. Step 3: Cross multiply
   21,640.50x = 34,239 × 34,239
4. Step 4: Simplify right side
   21,640.50x = 1,172,309,121
5. Step 5: Solve for x
   x = 1,172,309,121/21,640.50
6. Step 6: Final answer
   x = 54,172.00