Finding the Fourth Proportional to 1,158.46, 1,598.63 and 686.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.46 : 1,598.63 = 686.39 : x
2. Step 2: Convert to fraction form
   1,158.46/1,598.63 = 686.39/x
3. Step 3: Cross multiply
   1,158.46x = 1,598.63 × 686.39
4. Step 4: Simplify right side
   1,158.46x = 1,097,272.22
5. Step 5: Solve for x
   x = 1,097,272.22/1,158.46
6. Step 6: Final answer
   x = 947.18