Finding the Third Proportional to 78,187.78 and 159,139.69

Step by Step Solution

1. Step 1: Write the proportion equation
   78,187.78 : 159,139.69 = 159,139.69 : x
2. Step 2: Convert to fraction form
   78,187.78/159,139.69 = 159,139.69/x
3. Step 3: Cross multiply
   78,187.78x = 159,139.69 × 159,139.69
4. Step 4: Simplify right side
   78,187.78x = 25,325,440,137.60
5. Step 5: Solve for x
   x = 25,325,440,137.60/78,187.78
6. Step 6: Final answer
   x = 323,905.34