Finding the Fourth Proportional to 8,939.76, 12,335.40 and 5,583.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,939.76 : 12,335.40 = 5,583.12 : x
2. Step 2: Convert to fraction form
   8,939.76/12,335.40 = 5,583.12/x
3. Step 3: Cross multiply
   8,939.76x = 12,335.40 × 5,583.12
4. Step 4: Simplify right side
   8,939.76x = 68,870,018.45
5. Step 5: Solve for x
   x = 68,870,018.45/8,939.76
6. Step 6: Final answer
   x = 7,703.79