Finding the Third Proportional to 128,796 and 280,474.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,796 : 280,474.50 = 280,474.50 : x
2. Step 2: Convert to fraction form
   128,796/280,474.50 = 280,474.50/x
3. Step 3: Cross multiply
   128,796x = 280,474.50 × 280,474.50
4. Step 4: Simplify right side
   128,796x = 78,665,945,150.25
5. Step 5: Solve for x
   x = 78,665,945,150.25/128,796
6. Step 6: Final answer
   x = 610,779.41