Finding the Third Proportional to 100,579.50 and 209,426

Step by Step Solution

1. Step 1: Write the proportion equation
   100,579.50 : 209,426 = 209,426 : x
2. Step 2: Convert to fraction form
   100,579.50/209,426 = 209,426/x
3. Step 3: Cross multiply
   100,579.50x = 209,426 × 209,426
4. Step 4: Simplify right side
   100,579.50x = 43,859,249,476
5. Step 5: Solve for x
   x = 43,859,249,476/100,579.50
6. Step 6: Final answer
   x = 436,065.50