Finding the Fourth Proportional to 2,390.72, 3,587.44 and 1,418.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.72 : 3,587.44 = 1,418.72 : x
2. Step 2: Convert to fraction form
   2,390.72/3,587.44 = 1,418.72/x
3. Step 3: Cross multiply
   2,390.72x = 3,587.44 × 1,418.72
4. Step 4: Simplify right side
   2,390.72x = 5,089,572.88
5. Step 5: Solve for x
   x = 5,089,572.88/2,390.72
6. Step 6: Final answer
   x = 2,128.89