Finding the Third Proportional to 129,109.50 and 278,613

Step by Step Solution

1. Step 1: Write the proportion equation
   129,109.50 : 278,613 = 278,613 : x
2. Step 2: Convert to fraction form
   129,109.50/278,613 = 278,613/x
3. Step 3: Cross multiply
   129,109.50x = 278,613 × 278,613
4. Step 4: Simplify right side
   129,109.50x = 77,625,203,769
5. Step 5: Solve for x
   x = 77,625,203,769/129,109.50
6. Step 6: Final answer
   x = 601,235.41