Finding the Fourth Proportional to 2,617.28, 3,611.84 and 1,438.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.28 : 3,611.84 = 1,438.42 : x
2. Step 2: Convert to fraction form
   2,617.28/3,611.84 = 1,438.42/x
3. Step 3: Cross multiply
   2,617.28x = 3,611.84 × 1,438.42
4. Step 4: Simplify right side
   2,617.28x = 5,195,342.89
5. Step 5: Solve for x
   x = 5,195,342.89/2,617.28
6. Step 6: Final answer
   x = 1,985.02