Finding the Fourth Proportional to 3,611.89, 5,415.78 and 1,419.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,611.89 : 5,415.78 = 1,419.42 : x
2. Step 2: Convert to fraction form
   3,611.89/5,415.78 = 1,419.42/x
3. Step 3: Cross multiply
   3,611.89x = 5,415.78 × 1,419.42
4. Step 4: Simplify right side
   3,611.89x = 7,687,266.45
5. Step 5: Solve for x
   x = 7,687,266.45/3,611.89
6. Step 6: Final answer
   x = 2,128.32