Finding the Third Proportional to 288,661.50 and 429,912

Step by Step Solution

1. Step 1: Write the proportion equation
   288,661.50 : 429,912 = 429,912 : x
2. Step 2: Convert to fraction form
   288,661.50/429,912 = 429,912/x
3. Step 3: Cross multiply
   288,661.50x = 429,912 × 429,912
4. Step 4: Simplify right side
   288,661.50x = 184,824,327,744
5. Step 5: Solve for x
   x = 184,824,327,744/288,661.50
6. Step 6: Final answer
   x = 640,280.49