Finding the Third Proportional to 128,169.75 and 276,061.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,169.75 : 276,061.50 = 276,061.50 : x
2. Step 2: Convert to fraction form
   128,169.75/276,061.50 = 276,061.50/x
3. Step 3: Cross multiply
   128,169.75x = 276,061.50 × 276,061.50
4. Step 4: Simplify right side
   128,169.75x = 76,209,951,782.25
5. Step 5: Solve for x
   x = 76,209,951,782.25/128,169.75
6. Step 6: Final answer
   x = 594,601.70