Finding the Fourth Proportional to 9,408.55, 12,983.61 and 5,429.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,408.55 : 12,983.61 = 5,429.56 : x
2. Step 2: Convert to fraction form
   9,408.55/12,983.61 = 5,429.56/x
3. Step 3: Cross multiply
   9,408.55x = 12,983.61 × 5,429.56
4. Step 4: Simplify right side
   9,408.55x = 70,495,289.51
5. Step 5: Solve for x
   x = 70,495,289.51/9,408.55
6. Step 6: Final answer
   x = 7,492.68