Finding the Fourth Proportional to 2,158, 2,978.40 and 1,227.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158 : 2,978.40 = 1,227.04 : x
2. Step 2: Convert to fraction form
   2,158/2,978.40 = 1,227.04/x
3. Step 3: Cross multiply
   2,158x = 2,978.40 × 1,227.04
4. Step 4: Simplify right side
   2,158x = 3,654,615.94
5. Step 5: Solve for x
   x = 3,654,615.94/2,158
6. Step 6: Final answer
   x = 1,693.52