Finding the Fourth Proportional to 3,085.89, 4,258.53 and 1,688.64

Step by Step Solution

1. Step 1: Write the proportion equation
   3,085.89 : 4,258.53 = 1,688.64 : x
2. Step 2: Convert to fraction form
   3,085.89/4,258.53 = 1,688.64/x
3. Step 3: Cross multiply
   3,085.89x = 4,258.53 × 1,688.64
4. Step 4: Simplify right side
   3,085.89x = 7,191,124.10
5. Step 5: Solve for x
   x = 7,191,124.10/3,085.89
6. Step 6: Final answer
   x = 2,330.32