Finding the Fourth Proportional to 8,391.30, 12,586.83 and 3,393.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,391.30 : 12,586.83 = 3,393.60 : x
2. Step 2: Convert to fraction form
   8,391.30/12,586.83 = 3,393.60/x
3. Step 3: Cross multiply
   8,391.30x = 12,586.83 × 3,393.60
4. Step 4: Simplify right side
   8,391.30x = 42,714,603.35
5. Step 5: Solve for x
   x = 42,714,603.35/8,391.30
6. Step 6: Final answer
   x = 5,090.35