Finding the Third Proportional to 142,885.50 and 311,169

Step by Step Solution

1. Step 1: Write the proportion equation
   142,885.50 : 311,169 = 311,169 : x
2. Step 2: Convert to fraction form
   142,885.50/311,169 = 311,169/x
3. Step 3: Cross multiply
   142,885.50x = 311,169 × 311,169
4. Step 4: Simplify right side
   142,885.50x = 96,826,146,561
5. Step 5: Solve for x
   x = 96,826,146,561/142,885.50
6. Step 6: Final answer
   x = 677,648.51