Finding the Third Proportional to 276,307 and 415,485.50

Step by Step Solution

1. Step 1: Write the proportion equation
   276,307 : 415,485.50 = 415,485.50 : x
2. Step 2: Convert to fraction form
   276,307/415,485.50 = 415,485.50/x
3. Step 3: Cross multiply
   276,307x = 415,485.50 × 415,485.50
4. Step 4: Simplify right side
   276,307x = 172,628,200,710.25
5. Step 5: Solve for x
   x = 172,628,200,710.25/276,307
6. Step 6: Final answer
   x = 624,769.55