Finding the Fourth Proportional to 8,405.83, 12,608.80 and 3,142.03

Step by Step Solution

1. Step 1: Write the proportion equation
   8,405.83 : 12,608.80 = 3,142.03 : x
2. Step 2: Convert to fraction form
   8,405.83/12,608.80 = 3,142.03/x
3. Step 3: Cross multiply
   8,405.83x = 12,608.80 × 3,142.03
4. Step 4: Simplify right side
   8,405.83x = 39,617,164.82
5. Step 5: Solve for x
   x = 39,617,164.82/8,405.83
6. Step 6: Final answer
   x = 4,713.06