Finding the Fourth Proportional to 3,786.42, 5,679.92 and 1,321.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,786.42 : 5,679.92 = 1,321.18 : x
2. Step 2: Convert to fraction form
   3,786.42/5,679.92 = 1,321.18/x
3. Step 3: Cross multiply
   3,786.42x = 5,679.92 × 1,321.18
4. Step 4: Simplify right side
   3,786.42x = 7,504,196.71
5. Step 5: Solve for x
   x = 7,504,196.71/3,786.42
6. Step 6: Final answer
   x = 1,981.87