Finding the Fourth Proportional to 8,768.78, 12,100.72 and 4,789.91

Step by Step Solution

1. Step 1: Write the proportion equation
   8,768.78 : 12,100.72 = 4,789.91 : x
2. Step 2: Convert to fraction form
   8,768.78/12,100.72 = 4,789.91/x
3. Step 3: Cross multiply
   8,768.78x = 12,100.72 × 4,789.91
4. Step 4: Simplify right side
   8,768.78x = 57,961,335.79
5. Step 5: Solve for x
   x = 57,961,335.79/8,768.78
6. Step 6: Final answer
   x = 6,609.97