Finding the Third Proportional to 315,068 and 691,371.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,068 : 691,371.50 = 691,371.50 : x
2. Step 2: Convert to fraction form
   315,068/691,371.50 = 691,371.50/x
3. Step 3: Cross multiply
   315,068x = 691,371.50 × 691,371.50
4. Step 4: Simplify right side
   315,068x = 477,994,551,012.25
5. Step 5: Solve for x
   x = 477,994,551,012.25/315,068
6. Step 6: Final answer
   x = 1,517,115.51