Finding the Fourth Proportional to 8,186.89, 12,276.83 and 3,117.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,186.89 : 12,276.83 = 3,117.76 : x
2. Step 2: Convert to fraction form
   8,186.89/12,276.83 = 3,117.76/x
3. Step 3: Cross multiply
   8,186.89x = 12,276.83 × 3,117.76
4. Step 4: Simplify right side
   8,186.89x = 38,276,209.50
5. Step 5: Solve for x
   x = 38,276,209.50/8,186.89
6. Step 6: Final answer
   x = 4,675.31