Finding the Fourth Proportional to 12,777.38, 17,632.78 and 7,188.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,777.38 : 17,632.78 = 7,188.38 : x
2. Step 2: Convert to fraction form
   12,777.38/17,632.78 = 7,188.38/x
3. Step 3: Cross multiply
   12,777.38x = 17,632.78 × 7,188.38
4. Step 4: Simplify right side
   12,777.38x = 126,751,016.96
5. Step 5: Solve for x
   x = 126,751,016.96/12,777.38
6. Step 6: Final answer
   x = 9,919.96