Finding the Third Proportional to 129,451.50 and 283,111.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,451.50 : 283,111.50 = 283,111.50 : x
2. Step 2: Convert to fraction form
   129,451.50/283,111.50 = 283,111.50/x
3. Step 3: Cross multiply
   129,451.50x = 283,111.50 × 283,111.50
4. Step 4: Simplify right side
   129,451.50x = 80,152,121,432.25
5. Step 5: Solve for x
   x = 80,152,121,432.25/129,451.50
6. Step 6: Final answer
   x = 619,167.19