Finding the Third Proportional to 21,034.69 and 28,939.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,034.69 : 28,939.78 = 28,939.78 : x
2. Step 2: Convert to fraction form
   21,034.69/28,939.78 = 28,939.78/x
3. Step 3: Cross multiply
   21,034.69x = 28,939.78 × 28,939.78
4. Step 4: Simplify right side
   21,034.69x = 837,510,938.80
5. Step 5: Solve for x
   x = 837,510,938.80/21,034.69
6. Step 6: Final answer
   x = 39,815.71