Finding the Fourth Proportional to 2,615.90, 3,609.78 and 1,436.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.90 : 3,609.78 = 1,436.72 : x
2. Step 2: Convert to fraction form
   2,615.90/3,609.78 = 1,436.72/x
3. Step 3: Cross multiply
   2,615.90x = 3,609.78 × 1,436.72
4. Step 4: Simplify right side
   2,615.90x = 5,186,243.12
5. Step 5: Solve for x
   x = 5,186,243.12/2,615.90
6. Step 6: Final answer
   x = 1,982.58