Finding the Fourth Proportional to 8,185.62, 12,284.54 and 3,188.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,185.62 : 12,284.54 = 3,188.78 : x
2. Step 2: Convert to fraction form
   8,185.62/12,284.54 = 3,188.78/x
3. Step 3: Cross multiply
   8,185.62x = 12,284.54 × 3,188.78
4. Step 4: Simplify right side
   8,185.62x = 39,172,695.46
5. Step 5: Solve for x
   x = 39,172,695.46/8,185.62
6. Step 6: Final answer
   x = 4,785.55