Finding the Third Proportional to 120,817 and 284,285.50

Step by Step Solution

1. Step 1: Write the proportion equation
   120,817 : 284,285.50 = 284,285.50 : x
2. Step 2: Convert to fraction form
   120,817/284,285.50 = 284,285.50/x
3. Step 3: Cross multiply
   120,817x = 284,285.50 × 284,285.50
4. Step 4: Simplify right side
   120,817x = 80,818,245,510.25
5. Step 5: Solve for x
   x = 80,818,245,510.25/120,817
6. Step 6: Final answer
   x = 668,931.07