Finding the Third Proportional to 131,528.50 and 285,189.50

Step by Step Solution

1. Step 1: Write the proportion equation
   131,528.50 : 285,189.50 = 285,189.50 : x
2. Step 2: Convert to fraction form
   131,528.50/285,189.50 = 285,189.50/x
3. Step 3: Cross multiply
   131,528.50x = 285,189.50 × 285,189.50
4. Step 4: Simplify right side
   131,528.50x = 81,333,050,910.25
5. Step 5: Solve for x
   x = 81,333,050,910.25/131,528.50
6. Step 6: Final answer
   x = 618,368.27