Finding the Third Proportional to 515,451 and 788,485.50

Step by Step Solution

1. Step 1: Write the proportion equation
   515,451 : 788,485.50 = 788,485.50 : x
2. Step 2: Convert to fraction form
   515,451/788,485.50 = 788,485.50/x
3. Step 3: Cross multiply
   515,451x = 788,485.50 × 788,485.50
4. Step 4: Simplify right side
   515,451x = 621,709,383,710.25
5. Step 5: Solve for x
   x = 621,709,383,710.25/515,451
6. Step 6: Final answer
   x = 1,206,146.43