Finding the Fourth Proportional to 1,389.49, 1,919.09 and 946.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.49 : 1,919.09 = 946.62 : x
2. Step 2: Convert to fraction form
   1,389.49/1,919.09 = 946.62/x
3. Step 3: Cross multiply
   1,389.49x = 1,919.09 × 946.62
4. Step 4: Simplify right side
   1,389.49x = 1,816,648.98
5. Step 5: Solve for x
   x = 1,816,648.98/1,389.49
6. Step 6: Final answer
   x = 1,307.42