Finding the Third Proportional to 253,008.56 and 391,609.69

Step by Step Solution

1. Step 1: Write the proportion equation
   253,008.56 : 391,609.69 = 391,609.69 : x
2. Step 2: Convert to fraction form
   253,008.56/391,609.69 = 391,609.69/x
3. Step 3: Cross multiply
   253,008.56x = 391,609.69 × 391,609.69
4. Step 4: Simplify right side
   253,008.56x = 153,358,147,343.85
5. Step 5: Solve for x
   x = 153,358,147,343.85/253,008.56
6. Step 6: Final answer
   x = 606,138.17