Finding the Fourth Proportional to 8,611.31, 12,918.79 and 2,768.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,611.31 : 12,918.79 = 2,768.38 : x
2. Step 2: Convert to fraction form
   8,611.31/12,918.79 = 2,768.38/x
3. Step 3: Cross multiply
   8,611.31x = 12,918.79 × 2,768.38
4. Step 4: Simplify right side
   8,611.31x = 35,764,091.02
5. Step 5: Solve for x
   x = 35,764,091.02/8,611.31
6. Step 6: Final answer
   x = 4,153.15