Finding the Third Proportional to 9,158.50 and 19,739

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158.50 : 19,739 = 19,739 : x
2. Step 2: Convert to fraction form
   9,158.50/19,739 = 19,739/x
3. Step 3: Cross multiply
   9,158.50x = 19,739 × 19,739
4. Step 4: Simplify right side
   9,158.50x = 389,628,121
5. Step 5: Solve for x
   x = 389,628,121/9,158.50
6. Step 6: Final answer
   x = 42,542.79