Finding the Fourth Proportional to 9,360.78, 12,916.71 and 5,168.22

Step by Step Solution

1. Step 1: Write the proportion equation
   9,360.78 : 12,916.71 = 5,168.22 : x
2. Step 2: Convert to fraction form
   9,360.78/12,916.71 = 5,168.22/x
3. Step 3: Cross multiply
   9,360.78x = 12,916.71 × 5,168.22
4. Step 4: Simplify right side
   9,360.78x = 66,756,398.96
5. Step 5: Solve for x
   x = 66,756,398.96/9,360.78
6. Step 6: Final answer
   x = 7,131.50