Finding the Fourth Proportional to 1,408.88, 2,120.66 and 1,274.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.88 : 2,120.66 = 1,274.72 : x
2. Step 2: Convert to fraction form
   1,408.88/2,120.66 = 1,274.72/x
3. Step 3: Cross multiply
   1,408.88x = 2,120.66 × 1,274.72
4. Step 4: Simplify right side
   1,408.88x = 2,703,247.72
5. Step 5: Solve for x
   x = 2,703,247.72/1,408.88
6. Step 6: Final answer
   x = 1,918.72