Finding the Third Proportional to 678,156 and 923,530.50

Step by Step Solution

1. Step 1: Write the proportion equation
   678,156 : 923,530.50 = 923,530.50 : x
2. Step 2: Convert to fraction form
   678,156/923,530.50 = 923,530.50/x
3. Step 3: Cross multiply
   678,156x = 923,530.50 × 923,530.50
4. Step 4: Simplify right side
   678,156x = 852,908,584,430.25
5. Step 5: Solve for x
   x = 852,908,584,430.25/678,156
6. Step 6: Final answer
   x = 1,257,687.88