Finding the Fourth Proportional to 9,120.09, 12,581.78 and 5,343.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,120.09 : 12,581.78 = 5,343.42 : x
2. Step 2: Convert to fraction form
   9,120.09/12,581.78 = 5,343.42/x
3. Step 3: Cross multiply
   9,120.09x = 12,581.78 × 5,343.42
4. Step 4: Simplify right side
   9,120.09x = 67,229,714.64
5. Step 5: Solve for x
   x = 67,229,714.64/9,120.09
6. Step 6: Final answer
   x = 7,371.60