Finding the Fourth Proportional to 9,418.61, 12,997.74 and 5,439.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,418.61 : 12,997.74 = 5,439.71 : x
2. Step 2: Convert to fraction form
   9,418.61/12,997.74 = 5,439.71/x
3. Step 3: Cross multiply
   9,418.61x = 12,997.74 × 5,439.71
4. Step 4: Simplify right side
   9,418.61x = 70,703,871.27
5. Step 5: Solve for x
   x = 70,703,871.27/9,418.61
6. Step 6: Final answer
   x = 7,506.83