Finding the Third Proportional to 387,715.50 and 579,249

Step by Step Solution

1. Step 1: Write the proportion equation
   387,715.50 : 579,249 = 579,249 : x
2. Step 2: Convert to fraction form
   387,715.50/579,249 = 579,249/x
3. Step 3: Cross multiply
   387,715.50x = 579,249 × 579,249
4. Step 4: Simplify right side
   387,715.50x = 335,529,404,001
5. Step 5: Solve for x
   x = 335,529,404,001/387,715.50
6. Step 6: Final answer
   x = 865,401.06