Finding the Third Proportional to 663,388 and 1,439,406.50

Step by Step Solution

1. Step 1: Write the proportion equation
   663,388 : 1,439,406.50 = 1,439,406.50 : x
2. Step 2: Convert to fraction form
   663,388/1,439,406.50 = 1,439,406.50/x
3. Step 3: Cross multiply
   663,388x = 1,439,406.50 × 1,439,406.50
4. Step 4: Simplify right side
   663,388x = 2,071,891,072,242.25
5. Step 5: Solve for x
   x = 2,071,891,072,242.25/663,388
6. Step 6: Final answer
   x = 3,123,196.49