Finding the Third Proportional to 256,671 and 618,349.50

Step by Step Solution

1. Step 1: Write the proportion equation
   256,671 : 618,349.50 = 618,349.50 : x
2. Step 2: Convert to fraction form
   256,671/618,349.50 = 618,349.50/x
3. Step 3: Cross multiply
   256,671x = 618,349.50 × 618,349.50
4. Step 4: Simplify right side
   256,671x = 382,356,104,150.25
5. Step 5: Solve for x
   x = 382,356,104,150.25/256,671
6. Step 6: Final answer
   x = 1,489,673.96