Finding the Fourth Proportional to 8,490.81, 12,736.52 and 2,647.27

Step by Step Solution

1. Step 1: Write the proportion equation
   8,490.81 : 12,736.52 = 2,647.27 : x
2. Step 2: Convert to fraction form
   8,490.81/12,736.52 = 2,647.27/x
3. Step 3: Cross multiply
   8,490.81x = 12,736.52 × 2,647.27
4. Step 4: Simplify right side
   8,490.81x = 33,717,007.30
5. Step 5: Solve for x
   x = 33,717,007.30/8,490.81
6. Step 6: Final answer
   x = 3,971.00