Finding the Fourth Proportional to 2,156.15, 2,972.71 and 1,408.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.15 : 2,972.71 = 1,408.92 : x
2. Step 2: Convert to fraction form
   2,156.15/2,972.71 = 1,408.92/x
3. Step 3: Cross multiply
   2,156.15x = 2,972.71 × 1,408.92
4. Step 4: Simplify right side
   2,156.15x = 4,188,310.57
5. Step 5: Solve for x
   x = 4,188,310.57/2,156.15
6. Step 6: Final answer
   x = 1,942.49