Finding the Fourth Proportional to 3,085.32, 4,257.72 and 1,688.07

Step by Step Solution

1. Step 1: Write the proportion equation
   3,085.32 : 4,257.72 = 1,688.07 : x
2. Step 2: Convert to fraction form
   3,085.32/4,257.72 = 1,688.07/x
3. Step 3: Cross multiply
   3,085.32x = 4,257.72 × 1,688.07
4. Step 4: Simplify right side
   3,085.32x = 7,187,329.40
5. Step 5: Solve for x
   x = 7,187,329.40/3,085.32
6. Step 6: Final answer
   x = 2,329.52