Finding the Fourth Proportional to 8,390.56, 12,581.16 and 5,761.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,390.56 : 12,581.16 = 5,761.12 : x
2. Step 2: Convert to fraction form
   8,390.56/12,581.16 = 5,761.12/x
3. Step 3: Cross multiply
   8,390.56x = 12,581.16 × 5,761.12
4. Step 4: Simplify right side
   8,390.56x = 72,481,572.50
5. Step 5: Solve for x
   x = 72,481,572.50/8,390.56
6. Step 6: Final answer
   x = 8,638.47