Finding the Third Proportional to 249,933 and 387,111

Step by Step Solution

1. Step 1: Write the proportion equation
   249,933 : 387,111 = 387,111 : x
2. Step 2: Convert to fraction form
   249,933/387,111 = 387,111/x
3. Step 3: Cross multiply
   249,933x = 387,111 × 387,111
4. Step 4: Simplify right side
   249,933x = 149,854,926,321
5. Step 5: Solve for x
   x = 149,854,926,321/249,933
6. Step 6: Final answer
   x = 599,580.39