Finding the Fourth Proportional to 2,615.60, 3,609.50 and 1,420.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.60 : 3,609.50 = 1,420.58 : x
2. Step 2: Convert to fraction form
   2,615.60/3,609.50 = 1,420.58/x
3. Step 3: Cross multiply
   2,615.60x = 3,609.50 × 1,420.58
4. Step 4: Simplify right side
   2,615.60x = 5,127,585.43
5. Step 5: Solve for x
   x = 5,127,585.43/2,615.60
6. Step 6: Final answer
   x = 1,960.38