Finding the Fourth Proportional to 3,128.89, 4,695.56 and 2,309.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.89 : 4,695.56 = 2,309.30 : x
2. Step 2: Convert to fraction form
   3,128.89/4,695.56 = 2,309.30/x
3. Step 3: Cross multiply
   3,128.89x = 4,695.56 × 2,309.30
4. Step 4: Simplify right side
   3,128.89x = 10,843,456.71
5. Step 5: Solve for x
   x = 10,843,456.71/3,128.89
6. Step 6: Final answer
   x = 3,465.59