Finding the Third Proportional to 13,908 and 20,858

Step by Step Solution

1. Step 1: Write the proportion equation
   13,908 : 20,858 = 20,858 : x
2. Step 2: Convert to fraction form
   13,908/20,858 = 20,858/x
3. Step 3: Cross multiply
   13,908x = 20,858 × 20,858
4. Step 4: Simplify right side
   13,908x = 435,056,164
5. Step 5: Solve for x
   x = 435,056,164/13,908
6. Step 6: Final answer
   x = 31,281.00