Finding the Third Proportional to 129,109.69 and 279,658.31

Step by Step Solution

1. Step 1: Write the proportion equation
   129,109.69 : 279,658.31 = 279,658.31 : x
2. Step 2: Convert to fraction form
   129,109.69/279,658.31 = 279,658.31/x
3. Step 3: Cross multiply
   129,109.69x = 279,658.31 × 279,658.31
4. Step 4: Simplify right side
   129,109.69x = 78,208,771,750.35
5. Step 5: Solve for x
   x = 78,208,771,750.35/129,109.69
6. Step 6: Final answer
   x = 605,754.48