Finding the Third Proportional to 100,615.50 and 207,711

Step by Step Solution

1. Step 1: Write the proportion equation
   100,615.50 : 207,711 = 207,711 : x
2. Step 2: Convert to fraction form
   100,615.50/207,711 = 207,711/x
3. Step 3: Cross multiply
   100,615.50x = 207,711 × 207,711
4. Step 4: Simplify right side
   100,615.50x = 43,143,859,521
5. Step 5: Solve for x
   x = 43,143,859,521/100,615.50
6. Step 6: Final answer
   x = 428,799.34