Finding the Fourth Proportional to 8,885.40, 12,261.78 and 4,906.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,885.40 : 12,261.78 = 4,906.78 : x
2. Step 2: Convert to fraction form
   8,885.40/12,261.78 = 4,906.78/x
3. Step 3: Cross multiply
   8,885.40x = 12,261.78 × 4,906.78
4. Step 4: Simplify right side
   8,885.40x = 60,165,826.21
5. Step 5: Solve for x
   x = 60,165,826.21/8,885.40
6. Step 6: Final answer
   x = 6,771.32