Finding the Fourth Proportional to 8,936.56, 12,328.41 and 5,580.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,936.56 : 12,328.41 = 5,580.21 : x
2. Step 2: Convert to fraction form
   8,936.56/12,328.41 = 5,580.21/x
3. Step 3: Cross multiply
   8,936.56x = 12,328.41 × 5,580.21
4. Step 4: Simplify right side
   8,936.56x = 68,795,116.77
5. Step 5: Solve for x
   x = 68,795,116.77/8,936.56
6. Step 6: Final answer
   x = 7,698.17