Finding the Third Proportional to 5,118.19 and 10,423.69

Step by Step Solution

1. Step 1: Write the proportion equation
   5,118.19 : 10,423.69 = 10,423.69 : x
2. Step 2: Convert to fraction form
   5,118.19/10,423.69 = 10,423.69/x
3. Step 3: Cross multiply
   5,118.19x = 10,423.69 × 10,423.69
4. Step 4: Simplify right side
   5,118.19x = 108,653,261.10
5. Step 5: Solve for x
   x = 108,653,261.10/5,118.19
6. Step 6: Final answer
   x = 21,228.86