Finding the Fourth Proportional to 1,245.94, 1,719.29 and 686.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.94 : 1,719.29 = 686.27 : x
2. Step 2: Convert to fraction form
   1,245.94/1,719.29 = 686.27/x
3. Step 3: Cross multiply
   1,245.94x = 1,719.29 × 686.27
4. Step 4: Simplify right side
   1,245.94x = 1,179,900.27
5. Step 5: Solve for x
   x = 1,179,900.27/1,245.94
6. Step 6: Final answer
   x = 946.99