Finding the Fourth Proportional to 8,760.50, 12,090.61 and 5,782.54

Step by Step Solution

1. Step 1: Write the proportion equation
   8,760.50 : 12,090.61 = 5,782.54 : x
2. Step 2: Convert to fraction form
   8,760.50/12,090.61 = 5,782.54/x
3. Step 3: Cross multiply
   8,760.50x = 12,090.61 × 5,782.54
4. Step 4: Simplify right side
   8,760.50x = 69,914,375.50
5. Step 5: Solve for x
   x = 69,914,375.50/8,760.50
6. Step 6: Final answer
   x = 7,980.64