Finding the Third Proportional to 307,155 and 638,833.50

Step by Step Solution

1. Step 1: Write the proportion equation
   307,155 : 638,833.50 = 638,833.50 : x
2. Step 2: Convert to fraction form
   307,155/638,833.50 = 638,833.50/x
3. Step 3: Cross multiply
   307,155x = 638,833.50 × 638,833.50
4. Step 4: Simplify right side
   307,155x = 408,108,240,722.25
5. Step 5: Solve for x
   x = 408,108,240,722.25/307,155
6. Step 6: Final answer
   x = 1,328,671.98