Finding the Third Proportional to 619,216.50 and 871,992.50

Step by Step Solution

1. Step 1: Write the proportion equation
   619,216.50 : 871,992.50 = 871,992.50 : x
2. Step 2: Convert to fraction form
   619,216.50/871,992.50 = 871,992.50/x
3. Step 3: Cross multiply
   619,216.50x = 871,992.50 × 871,992.50
4. Step 4: Simplify right side
   619,216.50x = 760,370,920,056.25
5. Step 5: Solve for x
   x = 760,370,920,056.25/619,216.50
6. Step 6: Final answer
   x = 1,227,956.49