Finding the Fourth Proportional to 1,246.22, 1,719.82 and 686.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,246.22 : 1,719.82 = 686.71 : x
2. Step 2: Convert to fraction form
   1,246.22/1,719.82 = 686.71/x
3. Step 3: Cross multiply
   1,246.22x = 1,719.82 × 686.71
4. Step 4: Simplify right side
   1,246.22x = 1,181,017.59
5. Step 5: Solve for x
   x = 1,181,017.59/1,246.22
6. Step 6: Final answer
   x = 947.68