Finding the Third Proportional to 9,878 and 21,758

Step by Step Solution

1. Step 1: Write the proportion equation
   9,878 : 21,758 = 21,758 : x
2. Step 2: Convert to fraction form
   9,878/21,758 = 21,758/x
3. Step 3: Cross multiply
   9,878x = 21,758 × 21,758
4. Step 4: Simplify right side
   9,878x = 473,410,564
5. Step 5: Solve for x
   x = 473,410,564/9,878
6. Step 6: Final answer
   x = 47,925.75