Finding the Third Proportional to 129,997.69 and 279,397.69

Step by Step Solution

1. Step 1: Write the proportion equation
   129,997.69 : 279,397.69 = 279,397.69 : x
2. Step 2: Convert to fraction form
   129,997.69/279,397.69 = 279,397.69/x
3. Step 3: Cross multiply
   129,997.69x = 279,397.69 × 279,397.69
4. Step 4: Simplify right side
   129,997.69x = 78,063,067,780.35
5. Step 5: Solve for x
   x = 78,063,067,780.35/129,997.69
6. Step 6: Final answer
   x = 600,495.82