Finding the Third Proportional to 19,789.50 and 42,699

Step by Step Solution

1. Step 1: Write the proportion equation
   19,789.50 : 42,699 = 42,699 : x
2. Step 2: Convert to fraction form
   19,789.50/42,699 = 42,699/x
3. Step 3: Cross multiply
   19,789.50x = 42,699 × 42,699
4. Step 4: Simplify right side
   19,789.50x = 1,823,204,601
5. Step 5: Solve for x
   x = 1,823,204,601/19,789.50
6. Step 6: Final answer
   x = 92,129.90