Finding the Fourth Proportional to 2,140.49, 2,951.54 and 1,393.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.49 : 2,951.54 = 1,393.07 : x
2. Step 2: Convert to fraction form
   2,140.49/2,951.54 = 1,393.07/x
3. Step 3: Cross multiply
   2,140.49x = 2,951.54 × 1,393.07
4. Step 4: Simplify right side
   2,140.49x = 4,111,680.10
5. Step 5: Solve for x
   x = 4,111,680.10/2,140.49
6. Step 6: Final answer
   x = 1,920.91