Finding the Fourth Proportional to 8,262.28, 12,390.86 and 2,789

Step by Step Solution

1. Step 1: Write the proportion equation
   8,262.28 : 12,390.86 = 2,789 : x
2. Step 2: Convert to fraction form
   8,262.28/12,390.86 = 2,789/x
3. Step 3: Cross multiply
   8,262.28x = 12,390.86 × 2,789
4. Step 4: Simplify right side
   8,262.28x = 34,558,108.54
5. Step 5: Solve for x
   x = 34,558,108.54/8,262.28
6. Step 6: Final answer
   x = 4,182.64