Finding the Fourth Proportional to 2,615.40, 3,608.52 and 1,620.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.40 : 3,608.52 = 1,620.72 : x
2. Step 2: Convert to fraction form
   2,615.40/3,608.52 = 1,620.72/x
3. Step 3: Cross multiply
   2,615.40x = 3,608.52 × 1,620.72
4. Step 4: Simplify right side
   2,615.40x = 5,848,400.53
5. Step 5: Solve for x
   x = 5,848,400.53/2,615.40
6. Step 6: Final answer
   x = 2,236.14