Finding the Third Proportional to 21,991.50 and 42,882.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,991.50 : 42,882.75 = 42,882.75 : x
2. Step 2: Convert to fraction form
   21,991.50/42,882.75 = 42,882.75/x
3. Step 3: Cross multiply
   21,991.50x = 42,882.75 × 42,882.75
4. Step 4: Simplify right side
   21,991.50x = 1,838,930,247.56
5. Step 5: Solve for x
   x = 1,838,930,247.56/21,991.50
6. Step 6: Final answer
   x = 83,620.05