Finding the Fourth Proportional to 1,405.69, 1,940.29 and 939.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.69 : 1,940.29 = 939.94 : x
2. Step 2: Convert to fraction form
   1,405.69/1,940.29 = 939.94/x
3. Step 3: Cross multiply
   1,405.69x = 1,940.29 × 939.94
4. Step 4: Simplify right side
   1,405.69x = 1,823,748.98
5. Step 5: Solve for x
   x = 1,823,748.98/1,405.69
6. Step 6: Final answer
   x = 1,297.41