Finding the Third Proportional to 129,919.50 and 284,665.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,919.50 : 284,665.50 = 284,665.50 : x
2. Step 2: Convert to fraction form
   129,919.50/284,665.50 = 284,665.50/x
3. Step 3: Cross multiply
   129,919.50x = 284,665.50 × 284,665.50
4. Step 4: Simplify right side
   129,919.50x = 81,034,446,890.25
5. Step 5: Solve for x
   x = 81,034,446,890.25/129,919.50
6. Step 6: Final answer
   x = 623,728.13