Finding the Fourth Proportional to 8,557.13, 12,835.41 and 3,290.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,557.13 : 12,835.41 = 3,290.78 : x
2. Step 2: Convert to fraction form
   8,557.13/12,835.41 = 3,290.78/x
3. Step 3: Cross multiply
   8,557.13x = 12,835.41 × 3,290.78
4. Step 4: Simplify right side
   8,557.13x = 42,238,510.52
5. Step 5: Solve for x
   x = 42,238,510.52/8,557.13
6. Step 6: Final answer
   x = 4,936.06