Finding the Fourth Proportional to 9,160.56, 12,640.85 and 5,383.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,160.56 : 12,640.85 = 5,383.87 : x
2. Step 2: Convert to fraction form
   9,160.56/12,640.85 = 5,383.87/x
3. Step 3: Cross multiply
   9,160.56x = 12,640.85 × 5,383.87
4. Step 4: Simplify right side
   9,160.56x = 68,056,629.89
5. Step 5: Solve for x
   x = 68,056,629.89/9,160.56
6. Step 6: Final answer
   x = 7,429.31