Finding the Fourth Proportional to 9,386.52, 12,953.34 and 5,408.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,386.52 : 12,953.34 = 5,408.40 : x
2. Step 2: Convert to fraction form
   9,386.52/12,953.34 = 5,408.40/x
3. Step 3: Cross multiply
   9,386.52x = 12,953.34 × 5,408.40
4. Step 4: Simplify right side
   9,386.52x = 70,056,844.06
5. Step 5: Solve for x
   x = 70,056,844.06/9,386.52
6. Step 6: Final answer
   x = 7,463.56