Finding the Third Proportional to 4,243.38 and 9,139.75

Step by Step Solution

1. Step 1: Write the proportion equation
   4,243.38 : 9,139.75 = 9,139.75 : x
2. Step 2: Convert to fraction form
   4,243.38/9,139.75 = 9,139.75/x
3. Step 3: Cross multiply
   4,243.38x = 9,139.75 × 9,139.75
4. Step 4: Simplify right side
   4,243.38x = 83,535,030.06
5. Step 5: Solve for x
   x = 83,535,030.06/4,243.38
6. Step 6: Final answer
   x = 19,685.99