Finding the Fourth Proportional to 1,158.89, 1,599.02 and 686.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.89 : 1,599.02 = 686.79 : x
2. Step 2: Convert to fraction form
   1,158.89/1,599.02 = 686.79/x
3. Step 3: Cross multiply
   1,158.89x = 1,599.02 × 686.79
4. Step 4: Simplify right side
   1,158.89x = 1,098,187.51
5. Step 5: Solve for x
   x = 1,098,187.51/1,158.89
6. Step 6: Final answer
   x = 947.62