Finding the Third Proportional to 155,969.50 and 217,311.50

Step by Step Solution

1. Step 1: Write the proportion equation
   155,969.50 : 217,311.50 = 217,311.50 : x
2. Step 2: Convert to fraction form
   155,969.50/217,311.50 = 217,311.50/x
3. Step 3: Cross multiply
   155,969.50x = 217,311.50 × 217,311.50
4. Step 4: Simplify right side
   155,969.50x = 47,224,288,032.25
5. Step 5: Solve for x
   x = 47,224,288,032.25/155,969.50
6. Step 6: Final answer
   x = 302,778.99