Finding the Third Proportional to 619,215 and 871,990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   619,215 : 871,990.50 = 871,990.50 : x
2. Step 2: Convert to fraction form
   619,215/871,990.50 = 871,990.50/x
3. Step 3: Cross multiply
   619,215x = 871,990.50 × 871,990.50
4. Step 4: Simplify right side
   619,215x = 760,367,432,090.25
5. Step 5: Solve for x
   x = 760,367,432,090.25/619,215
6. Step 6: Final answer
   x = 1,227,953.83