Finding the Third Proportional to 129,910.50 and 285,108

Step by Step Solution

1. Step 1: Write the proportion equation
   129,910.50 : 285,108 = 285,108 : x
2. Step 2: Convert to fraction form
   129,910.50/285,108 = 285,108/x
3. Step 3: Cross multiply
   129,910.50x = 285,108 × 285,108
4. Step 4: Simplify right side
   129,910.50x = 81,286,571,664
5. Step 5: Solve for x
   x = 81,286,571,664/129,910.50
6. Step 6: Final answer
   x = 625,712.10