Finding the Fourth Proportional to 1,494.88, 2,238.21 and 1,128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,494.88 : 2,238.21 = 1,128.56 : x
2. Step 2: Convert to fraction form
   1,494.88/2,238.21 = 1,128.56/x
3. Step 3: Cross multiply
   1,494.88x = 2,238.21 × 1,128.56
4. Step 4: Simplify right side
   1,494.88x = 2,525,954.28
5. Step 5: Solve for x
   x = 2,525,954.28/1,494.88
6. Step 6: Final answer
   x = 1,689.74