Finding the Third Proportional to 5,123.25 and 10,434.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.25 : 10,434.50 = 10,434.50 : x
2. Step 2: Convert to fraction form
   5,123.25/10,434.50 = 10,434.50/x
3. Step 3: Cross multiply
   5,123.25x = 10,434.50 × 10,434.50
4. Step 4: Simplify right side
   5,123.25x = 108,878,790.25
5. Step 5: Solve for x
   x = 108,878,790.25/5,123.25
6. Step 6: Final answer
   x = 21,251.90