Finding the Third Proportional to 278,131.50 and 372,910.50

Step by Step Solution

1. Step 1: Write the proportion equation
   278,131.50 : 372,910.50 = 372,910.50 : x
2. Step 2: Convert to fraction form
   278,131.50/372,910.50 = 372,910.50/x
3. Step 3: Cross multiply
   278,131.50x = 372,910.50 × 372,910.50
4. Step 4: Simplify right side
   278,131.50x = 139,062,241,010.25
5. Step 5: Solve for x
   x = 139,062,241,010.25/278,131.50
6. Step 6: Final answer
   x = 499,987.38