Finding the Fourth Proportional to 9,351.87, 12,905.61 and 5,160.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,351.87 : 12,905.61 = 5,160.12 : x
2. Step 2: Convert to fraction form
   9,351.87/12,905.61 = 5,160.12/x
3. Step 3: Cross multiply
   9,351.87x = 12,905.61 × 5,160.12
4. Step 4: Simplify right side
   9,351.87x = 66,594,496.27
5. Step 5: Solve for x
   x = 66,594,496.27/9,351.87
6. Step 6: Final answer
   x = 7,120.98