Finding the Fourth Proportional to 8,517.78, 12,776.73 and 2,971.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,517.78 : 12,776.73 = 2,971.10 : x
2. Step 2: Convert to fraction form
   8,517.78/12,776.73 = 2,971.10/x
3. Step 3: Cross multiply
   8,517.78x = 12,776.73 × 2,971.10
4. Step 4: Simplify right side
   8,517.78x = 37,960,942.50
5. Step 5: Solve for x
   x = 37,960,942.50/8,517.78
6. Step 6: Final answer
   x = 4,456.67