Finding the Fourth Proportional to 2,158.57, 2,978.42 and 1,274.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.57 : 2,978.42 = 1,274.52 : x
2. Step 2: Convert to fraction form
   2,158.57/2,978.42 = 1,274.52/x
3. Step 3: Cross multiply
   2,158.57x = 2,978.42 × 1,274.52
4. Step 4: Simplify right side
   2,158.57x = 3,796,049.49
5. Step 5: Solve for x
   x = 3,796,049.49/2,158.57
6. Step 6: Final answer
   x = 1,758.60