Finding the Third Proportional to 126,139.50 and 263,961

Step by Step Solution

1. Step 1: Write the proportion equation
   126,139.50 : 263,961 = 263,961 : x
2. Step 2: Convert to fraction form
   126,139.50/263,961 = 263,961/x
3. Step 3: Cross multiply
   126,139.50x = 263,961 × 263,961
4. Step 4: Simplify right side
   126,139.50x = 69,675,409,521
5. Step 5: Solve for x
   x = 69,675,409,521/126,139.50
6. Step 6: Final answer
   x = 552,367.89