Finding the Fourth Proportional to 1,228.79, 1,696.38 and 948.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,228.79 : 1,696.38 = 948.42 : x
2. Step 2: Convert to fraction form
   1,228.79/1,696.38 = 948.42/x
3. Step 3: Cross multiply
   1,228.79x = 1,696.38 × 948.42
4. Step 4: Simplify right side
   1,228.79x = 1,608,880.72
5. Step 5: Solve for x
   x = 1,608,880.72/1,228.79
6. Step 6: Final answer
   x = 1,309.32