Finding the Fourth Proportional to 3,128.37, 4,317.03 and 1,802.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.37 : 4,317.03 = 1,802.31 : x
2. Step 2: Convert to fraction form
   3,128.37/4,317.03 = 1,802.31/x
3. Step 3: Cross multiply
   3,128.37x = 4,317.03 × 1,802.31
4. Step 4: Simplify right side
   3,128.37x = 7,780,626.34
5. Step 5: Solve for x
   x = 7,780,626.34/3,128.37
6. Step 6: Final answer
   x = 2,487.12