Finding the Fourth Proportional to 12,778.56, 19,177.97 and 5,388.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,778.56 : 19,177.97 = 5,388.12 : x
2. Step 2: Convert to fraction form
   12,778.56/19,177.97 = 5,388.12/x
3. Step 3: Cross multiply
   12,778.56x = 19,177.97 × 5,388.12
4. Step 4: Simplify right side
   12,778.56x = 103,333,176.78
5. Step 5: Solve for x
   x = 103,333,176.78/12,778.56
6. Step 6: Final answer
   x = 8,086.45