Finding the Fourth Proportional to 8,768.54, 13,155.89 and 5,477.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,768.54 : 13,155.89 = 5,477.78 : x
2. Step 2: Convert to fraction form
   8,768.54/13,155.89 = 5,477.78/x
3. Step 3: Cross multiply
   8,768.54x = 13,155.89 × 5,477.78
4. Step 4: Simplify right side
   8,768.54x = 72,065,076.63
5. Step 5: Solve for x
   x = 72,065,076.63/8,768.54
6. Step 6: Final answer
   x = 8,218.59