Finding the Fourth Proportional to 9,263.18, 12,789.15 and 8,266.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,263.18 : 12,789.15 = 8,266.75 : x
2. Step 2: Convert to fraction form
   9,263.18/12,789.15 = 8,266.75/x
3. Step 3: Cross multiply
   9,263.18x = 12,789.15 × 8,266.75
4. Step 4: Simplify right side
   9,263.18x = 105,724,705.76
5. Step 5: Solve for x
   x = 105,724,705.76/9,263.18
6. Step 6: Final answer
   x = 11,413.44