Finding the Fourth Proportional to 9,160.89, 13,730.71 and 4,220.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,160.89 : 13,730.71 = 4,220.15 : x
2. Step 2: Convert to fraction form
   9,160.89/13,730.71 = 4,220.15/x
3. Step 3: Cross multiply
   9,160.89x = 13,730.71 × 4,220.15
4. Step 4: Simplify right side
   9,160.89x = 57,945,576.60
5. Step 5: Solve for x
   x = 57,945,576.60/9,160.89
6. Step 6: Final answer
   x = 6,325.32