Finding the Third Proportional to 354,979.50 and 764,086.50

Step by Step Solution

1. Step 1: Write the proportion equation
   354,979.50 : 764,086.50 = 764,086.50 : x
2. Step 2: Convert to fraction form
   354,979.50/764,086.50 = 764,086.50/x
3. Step 3: Cross multiply
   354,979.50x = 764,086.50 × 764,086.50
4. Step 4: Simplify right side
   354,979.50x = 583,828,179,482.25
5. Step 5: Solve for x
   x = 583,828,179,482.25/354,979.50
6. Step 6: Final answer
   x = 1,644,681.40