Finding the Fourth Proportional to 2,158.32, 2,978.37 and 1,274.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.32 : 2,978.37 = 1,274.61 : x
2. Step 2: Convert to fraction form
   2,158.32/2,978.37 = 1,274.61/x
3. Step 3: Cross multiply
   2,158.32x = 2,978.37 × 1,274.61
4. Step 4: Simplify right side
   2,158.32x = 3,796,260.19
5. Step 5: Solve for x
   x = 3,796,260.19/2,158.32
6. Step 6: Final answer
   x = 1,758.90