Finding the Fourth Proportional to 2,616.98, 3,611.40 and 1,438.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,616.98 : 3,611.40 = 1,438.03 : x
2. Step 2: Convert to fraction form
   2,616.98/3,611.40 = 1,438.03/x
3. Step 3: Cross multiply
   2,616.98x = 3,611.40 × 1,438.03
4. Step 4: Simplify right side
   2,616.98x = 5,193,300.66
5. Step 5: Solve for x
   x = 5,193,300.66/2,616.98
6. Step 6: Final answer
   x = 1,984.47