Finding the Third Proportional to 9,378 and 20,139

Step by Step Solution

1. Step 1: Write the proportion equation
   9,378 : 20,139 = 20,139 : x
2. Step 2: Convert to fraction form
   9,378/20,139 = 20,139/x
3. Step 3: Cross multiply
   9,378x = 20,139 × 20,139
4. Step 4: Simplify right side
   9,378x = 405,579,321
5. Step 5: Solve for x
   x = 405,579,321/9,378
6. Step 6: Final answer
   x = 43,247.95