Finding the Third Proportional to 261,636 and 355,078.13

Step by Step Solution

1. Step 1: Write the proportion equation
   261,636 : 355,078.13 = 355,078.13 : x
2. Step 2: Convert to fraction form
   261,636/355,078.13 = 355,078.13/x
3. Step 3: Cross multiply
   261,636x = 355,078.13 × 355,078.13
4. Step 4: Simplify right side
   261,636x = 126,080,474,853.52
5. Step 5: Solve for x
   x = 126,080,474,853.52/261,636
6. Step 6: Final answer
   x = 481,892.69