Finding the Third Proportional to 209,650.50 and 279,321

Step by Step Solution

1. Step 1: Write the proportion equation
   209,650.50 : 279,321 = 279,321 : x
2. Step 2: Convert to fraction form
   209,650.50/279,321 = 279,321/x
3. Step 3: Cross multiply
   209,650.50x = 279,321 × 279,321
4. Step 4: Simplify right side
   209,650.50x = 78,020,221,041
5. Step 5: Solve for x
   x = 78,020,221,041/209,650.50
6. Step 6: Final answer
   x = 372,144.22