Finding the Fourth Proportional to 1,358.89, 1,874.23 and 939.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.89 : 1,874.23 = 939.94 : x
2. Step 2: Convert to fraction form
   1,358.89/1,874.23 = 939.94/x
3. Step 3: Cross multiply
   1,358.89x = 1,874.23 × 939.94
4. Step 4: Simplify right side
   1,358.89x = 1,761,663.75
5. Step 5: Solve for x
   x = 1,761,663.75/1,358.89
6. Step 6: Final answer
   x = 1,296.40