Finding the Fourth Proportional to 3,918.42, 5,874.72 and 2,164.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,918.42 : 5,874.72 = 2,164.20 : x
2. Step 2: Convert to fraction form
   3,918.42/5,874.72 = 2,164.20/x
3. Step 3: Cross multiply
   3,918.42x = 5,874.72 × 2,164.20
4. Step 4: Simplify right side
   3,918.42x = 12,714,069.02
5. Step 5: Solve for x
   x = 12,714,069.02/3,918.42
6. Step 6: Final answer
   x = 3,244.69