Finding the Third Proportional to 59,979.23 and 129,564.56

Step by Step Solution

1. Step 1: Write the proportion equation
   59,979.23 : 129,564.56 = 129,564.56 : x
2. Step 2: Convert to fraction form
   59,979.23/129,564.56 = 129,564.56/x
3. Step 3: Cross multiply
   59,979.23x = 129,564.56 × 129,564.56
4. Step 4: Simplify right side
   59,979.23x = 16,786,975,855.82
5. Step 5: Solve for x
   x = 16,786,975,855.82/59,979.23
6. Step 6: Final answer
   x = 279,879.80