Finding the Fourth Proportional to 8,760.72, 12,090.50 and 4,985.04

Step by Step Solution

1. Step 1: Write the proportion equation
   8,760.72 : 12,090.50 = 4,985.04 : x
2. Step 2: Convert to fraction form
   8,760.72/12,090.50 = 4,985.04/x
3. Step 3: Cross multiply
   8,760.72x = 12,090.50 × 4,985.04
4. Step 4: Simplify right side
   8,760.72x = 60,271,665.23
5. Step 5: Solve for x
   x = 60,271,665.23/8,760.72
6. Step 6: Final answer
   x = 6,879.76