Finding the Third Proportional to 128,540 and 276,816.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,540 : 276,816.50 = 276,816.50 : x
2. Step 2: Convert to fraction form
   128,540/276,816.50 = 276,816.50/x
3. Step 3: Cross multiply
   128,540x = 276,816.50 × 276,816.50
4. Step 4: Simplify right side
   128,540x = 76,627,374,672.25
5. Step 5: Solve for x
   x = 76,627,374,672.25/128,540
6. Step 6: Final answer
   x = 596,136.41