Finding the Fourth Proportional to 8,916.25, 12,303.39 and 5,139.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,916.25 : 12,303.39 = 5,139.38 : x
2. Step 2: Convert to fraction form
   8,916.25/12,303.39 = 5,139.38/x
3. Step 3: Cross multiply
   8,916.25x = 12,303.39 × 5,139.38
4. Step 4: Simplify right side
   8,916.25x = 63,231,796.50
5. Step 5: Solve for x
   x = 63,231,796.50/8,916.25
6. Step 6: Final answer
   x = 7,091.75