Finding the Fourth Proportional to 1,160.82, 1,601.35 and 688.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.82 : 1,601.35 = 688.51 : x
2. Step 2: Convert to fraction form
   1,160.82/1,601.35 = 688.51/x
3. Step 3: Cross multiply
   1,160.82x = 1,601.35 × 688.51
4. Step 4: Simplify right side
   1,160.82x = 1,102,540.31
5. Step 5: Solve for x
   x = 1,102,540.31/1,160.82
6. Step 6: Final answer
   x = 949.80