Finding the Fourth Proportional to 3,128.72, 4,317.64 and 1,802.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.72 : 4,317.64 = 1,802.18 : x
2. Step 2: Convert to fraction form
   3,128.72/4,317.64 = 1,802.18/x
3. Step 3: Cross multiply
   3,128.72x = 4,317.64 × 1,802.18
4. Step 4: Simplify right side
   3,128.72x = 7,781,164.46
5. Step 5: Solve for x
   x = 7,781,164.46/3,128.72
6. Step 6: Final answer
   x = 2,487.01