Finding the Fourth Proportional to 8,889.78, 12,268.17 and 4,911.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,889.78 : 12,268.17 = 4,911.15 : x
2. Step 2: Convert to fraction form
   8,889.78/12,268.17 = 4,911.15/x
3. Step 3: Cross multiply
   8,889.78x = 12,268.17 × 4,911.15
4. Step 4: Simplify right side
   8,889.78x = 60,250,823.10
5. Step 5: Solve for x
   x = 60,250,823.10/8,889.78
6. Step 6: Final answer
   x = 6,777.54