Finding the Fourth Proportional to 2,158.78, 2,978.66 and 1,372.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.78 : 2,978.66 = 1,372.54 : x
2. Step 2: Convert to fraction form
   2,158.78/2,978.66 = 1,372.54/x
3. Step 3: Cross multiply
   2,158.78x = 2,978.66 × 1,372.54
4. Step 4: Simplify right side
   2,158.78x = 4,088,330.00
5. Step 5: Solve for x
   x = 4,088,330.00/2,158.78
6. Step 6: Final answer
   x = 1,893.82