Finding the Third Proportional to 128,542 and 276,820.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,542 : 276,820.50 = 276,820.50 : x
2. Step 2: Convert to fraction form
   128,542/276,820.50 = 276,820.50/x
3. Step 3: Cross multiply
   128,542x = 276,820.50 × 276,820.50
4. Step 4: Simplify right side
   128,542x = 76,629,589,220.25
5. Step 5: Solve for x
   x = 76,629,589,220.25/128,542
6. Step 6: Final answer
   x = 596,144.37