Finding the Third Proportional to 21,828 and 47,139

Step by Step Solution

1. Step 1: Write the proportion equation
   21,828 : 47,139 = 47,139 : x
2. Step 2: Convert to fraction form
   21,828/47,139 = 47,139/x
3. Step 3: Cross multiply
   21,828x = 47,139 × 47,139
4. Step 4: Simplify right side
   21,828x = 2,222,085,321
5. Step 5: Solve for x
   x = 2,222,085,321/21,828
6. Step 6: Final answer
   x = 101,799.77