Finding the Fourth Proportional to 2,141.72, 2,956.43 and 1,396.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,141.72 : 2,956.43 = 1,396.31 : x
2. Step 2: Convert to fraction form
   2,141.72/2,956.43 = 1,396.31/x
3. Step 3: Cross multiply
   2,141.72x = 2,956.43 × 1,396.31
4. Step 4: Simplify right side
   2,141.72x = 4,128,092.77
5. Step 5: Solve for x
   x = 4,128,092.77/2,141.72
6. Step 6: Final answer
   x = 1,927.47