Finding the Third Proportional to 78,161.50 and 120,978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,161.50 : 120,978.50 = 120,978.50 : x
2. Step 2: Convert to fraction form
   78,161.50/120,978.50 = 120,978.50/x
3. Step 3: Cross multiply
   78,161.50x = 120,978.50 × 120,978.50
4. Step 4: Simplify right side
   78,161.50x = 14,635,797,462.25
5. Step 5: Solve for x
   x = 14,635,797,462.25/78,161.50
6. Step 6: Final answer
   x = 187,250.72