Finding the Third Proportional to 295,978.50 and 641,853

Step by Step Solution

1. Step 1: Write the proportion equation
   295,978.50 : 641,853 = 641,853 : x
2. Step 2: Convert to fraction form
   295,978.50/641,853 = 641,853/x
3. Step 3: Cross multiply
   295,978.50x = 641,853 × 641,853
4. Step 4: Simplify right side
   295,978.50x = 411,975,273,609
5. Step 5: Solve for x
   x = 411,975,273,609/295,978.50
6. Step 6: Final answer
   x = 1,391,909.46