Finding the Third Proportional to 78,399.56 and 166,912.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,399.56 : 166,912.31 = 166,912.31 : x
2. Step 2: Convert to fraction form
   78,399.56/166,912.31 = 166,912.31/x
3. Step 3: Cross multiply
   78,399.56x = 166,912.31 × 166,912.31
4. Step 4: Simplify right side
   78,399.56x = 27,859,720,064.10
5. Step 5: Solve for x
   x = 27,859,720,064.10/78,399.56
6. Step 6: Final answer
   x = 355,355.56