Finding the Fourth Proportional to 2,156.85, 2,975.40 and 1,371.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.85 : 2,975.40 = 1,371.15 : x
2. Step 2: Convert to fraction form
   2,156.85/2,975.40 = 1,371.15/x
3. Step 3: Cross multiply
   2,156.85x = 2,975.40 × 1,371.15
4. Step 4: Simplify right side
   2,156.85x = 4,079,719.71
5. Step 5: Solve for x
   x = 4,079,719.71/2,156.85
6. Step 6: Final answer
   x = 1,891.52