Finding the Third Proportional to 315,171 and 691,537.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,171 : 691,537.50 = 691,537.50 : x
2. Step 2: Convert to fraction form
   315,171/691,537.50 = 691,537.50/x
3. Step 3: Cross multiply
   315,171x = 691,537.50 × 691,537.50
4. Step 4: Simplify right side
   315,171x = 478,224,113,906.25
5. Step 5: Solve for x
   x = 478,224,113,906.25/315,171
6. Step 6: Final answer
   x = 1,517,348.09