Finding the Fourth Proportional to 2,164.42, 2,986.72 and 1,219.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.42 : 2,986.72 = 1,219.92 : x
2. Step 2: Convert to fraction form
   2,164.42/2,986.72 = 1,219.92/x
3. Step 3: Cross multiply
   2,164.42x = 2,986.72 × 1,219.92
4. Step 4: Simplify right side
   2,164.42x = 3,643,559.46
5. Step 5: Solve for x
   x = 3,643,559.46/2,164.42
6. Step 6: Final answer
   x = 1,683.39