Finding the Fourth Proportional to 2,157.99, 2,978.04 and 1,274.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.99 : 2,978.04 = 1,274.23 : x
2. Step 2: Convert to fraction form
   2,157.99/2,978.04 = 1,274.23/x
3. Step 3: Cross multiply
   2,157.99x = 2,978.04 × 1,274.23
4. Step 4: Simplify right side
   2,157.99x = 3,794,712.83
5. Step 5: Solve for x
   x = 3,794,712.83/2,157.99
6. Step 6: Final answer
   x = 1,758.45