Finding the Fourth Proportional to 8,127.20, 12,188.88 and 3,507.68

Step by Step Solution

1. Step 1: Write the proportion equation
   8,127.20 : 12,188.88 = 3,507.68 : x
2. Step 2: Convert to fraction form
   8,127.20/12,188.88 = 3,507.68/x
3. Step 3: Cross multiply
   8,127.20x = 12,188.88 × 3,507.68
4. Step 4: Simplify right side
   8,127.20x = 42,754,690.60
5. Step 5: Solve for x
   x = 42,754,690.60/8,127.20
6. Step 6: Final answer
   x = 5,260.69