Finding the Fourth Proportional to 3,085.31, 4,257.74 and 1,688.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,085.31 : 4,257.74 = 1,688.06 : x
2. Step 2: Convert to fraction form
   3,085.31/4,257.74 = 1,688.06/x
3. Step 3: Cross multiply
   3,085.31x = 4,257.74 × 1,688.06
4. Step 4: Simplify right side
   3,085.31x = 7,187,335.45
5. Step 5: Solve for x
   x = 7,187,335.45/3,085.31
6. Step 6: Final answer
   x = 2,329.53