Finding the Third Proportional to 345,556.50 and 515,670

Step by Step Solution

1. Step 1: Write the proportion equation
   345,556.50 : 515,670 = 515,670 : x
2. Step 2: Convert to fraction form
   345,556.50/515,670 = 515,670/x
3. Step 3: Cross multiply
   345,556.50x = 515,670 × 515,670
4. Step 4: Simplify right side
   345,556.50x = 265,915,548,900
5. Step 5: Solve for x
   x = 265,915,548,900/345,556.50
6. Step 6: Final answer
   x = 769,528.42