Finding the Third Proportional to 287,971.50 and 387,667

Step by Step Solution

1. Step 1: Write the proportion equation
   287,971.50 : 387,667 = 387,667 : x
2. Step 2: Convert to fraction form
   287,971.50/387,667 = 387,667/x
3. Step 3: Cross multiply
   287,971.50x = 387,667 × 387,667
4. Step 4: Simplify right side
   287,971.50x = 150,285,702,889
5. Step 5: Solve for x
   x = 150,285,702,889/287,971.50
6. Step 6: Final answer
   x = 521,877.00