Finding the Third Proportional to 678,123 and 929,839.50

Step by Step Solution

1. Step 1: Write the proportion equation
   678,123 : 929,839.50 = 929,839.50 : x
2. Step 2: Convert to fraction form
   678,123/929,839.50 = 929,839.50/x
3. Step 3: Cross multiply
   678,123x = 929,839.50 × 929,839.50
4. Step 4: Simplify right side
   678,123x = 864,601,495,760.25
5. Step 5: Solve for x
   x = 864,601,495,760.25/678,123
6. Step 6: Final answer
   x = 1,274,992.14