Finding the Third Proportional to 311,728.50 and 672,102

Step by Step Solution

1. Step 1: Write the proportion equation
   311,728.50 : 672,102 = 672,102 : x
2. Step 2: Convert to fraction form
   311,728.50/672,102 = 672,102/x
3. Step 3: Cross multiply
   311,728.50x = 672,102 × 672,102
4. Step 4: Simplify right side
   311,728.50x = 451,721,098,404
5. Step 5: Solve for x
   x = 451,721,098,404/311,728.50
6. Step 6: Final answer
   x = 1,449,085.02