Finding the Third Proportional to 315,288.50 and 691,894

Step by Step Solution

1. Step 1: Write the proportion equation
   315,288.50 : 691,894 = 691,894 : x
2. Step 2: Convert to fraction form
   315,288.50/691,894 = 691,894/x
3. Step 3: Cross multiply
   315,288.50x = 691,894 × 691,894
4. Step 4: Simplify right side
   315,288.50x = 478,717,307,236
5. Step 5: Solve for x
   x = 478,717,307,236/315,288.50
6. Step 6: Final answer
   x = 1,518,346.87