Finding the Third Proportional to 677,989 and 919,753.50

Step by Step Solution

1. Step 1: Write the proportion equation
   677,989 : 919,753.50 = 919,753.50 : x
2. Step 2: Convert to fraction form
   677,989/919,753.50 = 919,753.50/x
3. Step 3: Cross multiply
   677,989x = 919,753.50 × 919,753.50
4. Step 4: Simplify right side
   677,989x = 845,946,500,762.25
5. Step 5: Solve for x
   x = 845,946,500,762.25/677,989
6. Step 6: Final answer
   x = 1,247,728.95