Finding the Fourth Proportional to 2,158.64, 2,978.81 and 1,274.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.64 : 2,978.81 = 1,274.12 : x
2. Step 2: Convert to fraction form
   2,158.64/2,978.81 = 1,274.12/x
3. Step 3: Cross multiply
   2,158.64x = 2,978.81 × 1,274.12
4. Step 4: Simplify right side
   2,158.64x = 3,795,355.03
5. Step 5: Solve for x
   x = 3,795,355.03/2,158.64
6. Step 6: Final answer
   x = 1,758.22