Finding the Third Proportional to 269,811.50 and 389,800.50

Step by Step Solution

1. Step 1: Write the proportion equation
   269,811.50 : 389,800.50 = 389,800.50 : x
2. Step 2: Convert to fraction form
   269,811.50/389,800.50 = 389,800.50/x
3. Step 3: Cross multiply
   269,811.50x = 389,800.50 × 389,800.50
4. Step 4: Simplify right side
   269,811.50x = 151,944,429,800.25
5. Step 5: Solve for x
   x = 151,944,429,800.25/269,811.50
6. Step 6: Final answer
   x = 563,150.31