Finding the Fourth Proportional to 8,760.42, 12,091.68 and 5,406.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,760.42 : 12,091.68 = 5,406.12 : x
2. Step 2: Convert to fraction form
   8,760.42/12,091.68 = 5,406.12/x
3. Step 3: Cross multiply
   8,760.42x = 12,091.68 × 5,406.12
4. Step 4: Simplify right side
   8,760.42x = 65,369,073.08
5. Step 5: Solve for x
   x = 65,369,073.08/8,760.42
6. Step 6: Final answer
   x = 7,461.87