Finding the Third Proportional to 21,757.50 and 29,139.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,757.50 : 29,139.75 = 29,139.75 : x
2. Step 2: Convert to fraction form
   21,757.50/29,139.75 = 29,139.75/x
3. Step 3: Cross multiply
   21,757.50x = 29,139.75 × 29,139.75
4. Step 4: Simplify right side
   21,757.50x = 849,125,030.06
5. Step 5: Solve for x
   x = 849,125,030.06/21,757.50
6. Step 6: Final answer
   x = 39,026.77