Finding the Fourth Proportional to 8,916.56, 12,304.83 and 5,139.71

Step by Step Solution

1. Step 1: Write the proportion equation
   8,916.56 : 12,304.83 = 5,139.71 : x
2. Step 2: Convert to fraction form
   8,916.56/12,304.83 = 5,139.71/x
3. Step 3: Cross multiply
   8,916.56x = 12,304.83 × 5,139.71
4. Step 4: Simplify right side
   8,916.56x = 63,243,221.47
5. Step 5: Solve for x
   x = 63,243,221.47/8,916.56
6. Step 6: Final answer
   x = 7,092.78