Finding the Third Proportional to 100,404 and 209,124

Step by Step Solution

1. Step 1: Write the proportion equation
   100,404 : 209,124 = 209,124 : x
2. Step 2: Convert to fraction form
   100,404/209,124 = 209,124/x
3. Step 3: Cross multiply
   100,404x = 209,124 × 209,124
4. Step 4: Simplify right side
   100,404x = 43,732,847,376
5. Step 5: Solve for x
   x = 43,732,847,376/100,404
6. Step 6: Final answer
   x = 435,568.78