Finding the Third Proportional to 10,139 and 19,787

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139 : 19,787 = 19,787 : x
2. Step 2: Convert to fraction form
   10,139/19,787 = 19,787/x
3. Step 3: Cross multiply
   10,139x = 19,787 × 19,787
4. Step 4: Simplify right side
   10,139x = 391,525,369
5. Step 5: Solve for x
   x = 391,525,369/10,139
6. Step 6: Final answer
   x = 38,615.78