Finding the Third Proportional to 249,939 and 387,118.50

Step by Step Solution

1. Step 1: Write the proportion equation
   249,939 : 387,118.50 = 387,118.50 : x
2. Step 2: Convert to fraction form
   249,939/387,118.50 = 387,118.50/x
3. Step 3: Cross multiply
   249,939x = 387,118.50 × 387,118.50
4. Step 4: Simplify right side
   249,939x = 149,860,733,042.25
5. Step 5: Solve for x
   x = 149,860,733,042.25/249,939
6. Step 6: Final answer
   x = 599,589.23