Finding the Third Proportional to 315,936 and 515,821.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,936 : 515,821.50 = 515,821.50 : x
2. Step 2: Convert to fraction form
   315,936/515,821.50 = 515,821.50/x
3. Step 3: Cross multiply
   315,936x = 515,821.50 × 515,821.50
4. Step 4: Simplify right side
   315,936x = 266,071,819,862.25
5. Step 5: Solve for x
   x = 266,071,819,862.25/315,936
6. Step 6: Final answer
   x = 842,170.00