Finding the Third Proportional to 5,135 and 10,458

Step by Step Solution

1. Step 1: Write the proportion equation
   5,135 : 10,458 = 10,458 : x
2. Step 2: Convert to fraction form
   5,135/10,458 = 10,458/x
3. Step 3: Cross multiply
   5,135x = 10,458 × 10,458
4. Step 4: Simplify right side
   5,135x = 109,369,764
5. Step 5: Solve for x
   x = 109,369,764/5,135
6. Step 6: Final answer
   x = 21,298.88