Finding the Fourth Proportional to 2,615.88, 3,609.81 and 1,420.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.88 : 3,609.81 = 1,420.81 : x
2. Step 2: Convert to fraction form
   2,615.88/3,609.81 = 1,420.81/x
3. Step 3: Cross multiply
   2,615.88x = 3,609.81 × 1,420.81
4. Step 4: Simplify right side
   2,615.88x = 5,128,854.15
5. Step 5: Solve for x
   x = 5,128,854.15/2,615.88
6. Step 6: Final answer
   x = 1,960.66