Finding the Fourth Proportional to 2,539.60, 3,504.61 and 1,420.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,539.60 : 3,504.61 = 1,420.52 : x
2. Step 2: Convert to fraction form
   2,539.60/3,504.61 = 1,420.52/x
3. Step 3: Cross multiply
   2,539.60x = 3,504.61 × 1,420.52
4. Step 4: Simplify right side
   2,539.60x = 4,978,386.35
5. Step 5: Solve for x
   x = 4,978,386.35/2,539.60
6. Step 6: Final answer
   x = 1,960.31