Finding the Third Proportional to 276,318 and 415,501.50

Step by Step Solution

1. Step 1: Write the proportion equation
   276,318 : 415,501.50 = 415,501.50 : x
2. Step 2: Convert to fraction form
   276,318/415,501.50 = 415,501.50/x
3. Step 3: Cross multiply
   276,318x = 415,501.50 × 415,501.50
4. Step 4: Simplify right side
   276,318x = 172,641,496,502.25
5. Step 5: Solve for x
   x = 172,641,496,502.25/276,318
6. Step 6: Final answer
   x = 624,792.80