Finding the Third Proportional to 328,660.50 and 690,528

Step by Step Solution

1. Step 1: Write the proportion equation
   328,660.50 : 690,528 = 690,528 : x
2. Step 2: Convert to fraction form
   328,660.50/690,528 = 690,528/x
3. Step 3: Cross multiply
   328,660.50x = 690,528 × 690,528
4. Step 4: Simplify right side
   328,660.50x = 476,828,918,784
5. Step 5: Solve for x
   x = 476,828,918,784/328,660.50
6. Step 6: Final answer
   x = 1,450,825.15