Finding the Third Proportional to 278,005.50 and 610,139.25

Step by Step Solution

1. Step 1: Write the proportion equation
   278,005.50 : 610,139.25 = 610,139.25 : x
2. Step 2: Convert to fraction form
   278,005.50/610,139.25 = 610,139.25/x
3. Step 3: Cross multiply
   278,005.50x = 610,139.25 × 610,139.25
4. Step 4: Simplify right side
   278,005.50x = 372,269,904,390.56
5. Step 5: Solve for x
   x = 372,269,904,390.56/278,005.50
6. Step 6: Final answer
   x = 1,339,073.88