Finding the Fourth Proportional to 9,389.87, 12,957.59 and 5,411.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,389.87 : 12,957.59 = 5,411.55 : x
2. Step 2: Convert to fraction form
   9,389.87/12,957.59 = 5,411.55/x
3. Step 3: Cross multiply
   9,389.87x = 12,957.59 × 5,411.55
4. Step 4: Simplify right side
   9,389.87x = 70,120,659.69
5. Step 5: Solve for x
   x = 70,120,659.69/9,389.87
6. Step 6: Final answer
   x = 7,467.70