Finding the Third Proportional to 678,800.50 and 1,006,458.50

Step by Step Solution

1. Step 1: Write the proportion equation
   678,800.50 : 1,006,458.50 = 1,006,458.50 : x
2. Step 2: Convert to fraction form
   678,800.50/1,006,458.50 = 1,006,458.50/x
3. Step 3: Cross multiply
   678,800.50x = 1,006,458.50 × 1,006,458.50
4. Step 4: Simplify right side
   678,800.50x = 1,012,958,712,222.25
5. Step 5: Solve for x
   x = 1,012,958,712,222.25/678,800.50
6. Step 6: Final answer
   x = 1,492,277.50