Finding the Fourth Proportional to 9,387.63, 12,957.81 and 5,411.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,387.63 : 12,957.81 = 5,411.40 : x
2. Step 2: Convert to fraction form
   9,387.63/12,957.81 = 5,411.40/x
3. Step 3: Cross multiply
   9,387.63x = 12,957.81 × 5,411.40
4. Step 4: Simplify right side
   9,387.63x = 70,119,893.03
5. Step 5: Solve for x
   x = 70,119,893.03/9,387.63
6. Step 6: Final answer
   x = 7,469.39