Finding the Fourth Proportional to 9,162.15, 12,643.91 and 5,385.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,162.15 : 12,643.91 = 5,385.42 : x
2. Step 2: Convert to fraction form
   9,162.15/12,643.91 = 5,385.42/x
3. Step 3: Cross multiply
   9,162.15x = 12,643.91 × 5,385.42
4. Step 4: Simplify right side
   9,162.15x = 68,092,765.79
5. Step 5: Solve for x
   x = 68,092,765.79/9,162.15
6. Step 6: Final answer
   x = 7,431.96