Finding the Fourth Proportional to 10,288.56, 14,190.88 and 8,705.64

Step by Step Solution

1. Step 1: Write the proportion equation
   10,288.56 : 14,190.88 = 8,705.64 : x
2. Step 2: Convert to fraction form
   10,288.56/14,190.88 = 8,705.64/x
3. Step 3: Cross multiply
   10,288.56x = 14,190.88 × 8,705.64
4. Step 4: Simplify right side
   10,288.56x = 123,540,692.56
5. Step 5: Solve for x
   x = 123,540,692.56/10,288.56
6. Step 6: Final answer
   x = 12,007.58