Finding the Third Proportional to 433,513.50 and 690,402

Step by Step Solution

1. Step 1: Write the proportion equation
   433,513.50 : 690,402 = 690,402 : x
2. Step 2: Convert to fraction form
   433,513.50/690,402 = 690,402/x
3. Step 3: Cross multiply
   433,513.50x = 690,402 × 690,402
4. Step 4: Simplify right side
   433,513.50x = 476,654,921,604
5. Step 5: Solve for x
   x = 476,654,921,604/433,513.50
6. Step 6: Final answer
   x = 1,099,515.75