Finding the Third Proportional to 128,847.72 and 274,807.55

Step by Step Solution

1. Step 1: Write the proportion equation
   128,847.72 : 274,807.55 = 274,807.55 : x
2. Step 2: Convert to fraction form
   128,847.72/274,807.55 = 274,807.55/x
3. Step 3: Cross multiply
   128,847.72x = 274,807.55 × 274,807.55
4. Step 4: Simplify right side
   128,847.72x = 75,519,189,027.10
5. Step 5: Solve for x
   x = 75,519,189,027.10/128,847.72
6. Step 6: Final answer
   x = 586,111.93