Finding the Fourth Proportional to 8,078.81, 12,059.00 and 7,485.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,078.81 : 12,059.00 = 7,485.15 : x
2. Step 2: Convert to fraction form
   8,078.81/12,059.00 = 7,485.15/x
3. Step 3: Cross multiply
   8,078.81x = 12,059.00 × 7,485.15
4. Step 4: Simplify right side
   8,078.81x = 90,263,357.97
5. Step 5: Solve for x
   x = 90,263,357.97/8,078.81
6. Step 6: Final answer
   x = 11,172.86