Finding the Third Proportional to 309,132 and 672,700

Step by Step Solution

1. Step 1: Write the proportion equation
   309,132 : 672,700 = 672,700 : x
2. Step 2: Convert to fraction form
   309,132/672,700 = 672,700/x
3. Step 3: Cross multiply
   309,132x = 672,700 × 672,700
4. Step 4: Simplify right side
   309,132x = 452,525,290,000
5. Step 5: Solve for x
   x = 452,525,290,000/309,132
6. Step 6: Final answer
   x = 1,463,857.80