Finding the Fourth Proportional to 2,137.49, 2,947.89 and 1,391.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,137.49 : 2,947.89 = 1,391.18 : x
2. Step 2: Convert to fraction form
   2,137.49/2,947.89 = 1,391.18/x
3. Step 3: Cross multiply
   2,137.49x = 2,947.89 × 1,391.18
4. Step 4: Simplify right side
   2,137.49x = 4,101,045.61
5. Step 5: Solve for x
   x = 4,101,045.61/2,137.49
6. Step 6: Final answer
   x = 1,918.63