Finding the Fourth Proportional to 4,003.08, 5,999.31 and 2,128.58

Step by Step Solution

1. Step 1: Write the proportion equation
   4,003.08 : 5,999.31 = 2,128.58 : x
2. Step 2: Convert to fraction form
   4,003.08/5,999.31 = 2,128.58/x
3. Step 3: Cross multiply
   4,003.08x = 5,999.31 × 2,128.58
4. Step 4: Simplify right side
   4,003.08x = 12,770,011.28
5. Step 5: Solve for x
   x = 12,770,011.28/4,003.08
6. Step 6: Final answer
   x = 3,190.05