Finding the Fourth Proportional to 3,128.89, 4,319.43 and 1,802.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.89 : 4,319.43 = 1,802.34 : x
2. Step 2: Convert to fraction form
   3,128.89/4,319.43 = 1,802.34/x
3. Step 3: Cross multiply
   3,128.89x = 4,319.43 × 1,802.34
4. Step 4: Simplify right side
   3,128.89x = 7,785,072.45
5. Step 5: Solve for x
   x = 7,785,072.45/3,128.89
6. Step 6: Final answer
   x = 2,488.13