Finding the Fourth Proportional to 2,158.35, 2,978.61 and 1,274.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.35 : 2,978.61 = 1,274.15 : x
2. Step 2: Convert to fraction form
   2,158.35/2,978.61 = 1,274.15/x
3. Step 3: Cross multiply
   2,158.35x = 2,978.61 × 1,274.15
4. Step 4: Simplify right side
   2,158.35x = 3,795,195.93
5. Step 5: Solve for x
   x = 3,795,195.93/2,158.35
6. Step 6: Final answer
   x = 1,758.38