Finding the Third Proportional to 315,126 and 691,474.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,126 : 691,474.50 = 691,474.50 : x
2. Step 2: Convert to fraction form
   315,126/691,474.50 = 691,474.50/x
3. Step 3: Cross multiply
   315,126x = 691,474.50 × 691,474.50
4. Step 4: Simplify right side
   315,126x = 478,136,984,150.25
5. Step 5: Solve for x
   x = 478,136,984,150.25/315,126
6. Step 6: Final answer
   x = 1,517,288.27