Finding the Fourth Proportional to 2,620.48, 3,615.78 and 1,558.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.48 : 3,615.78 = 1,558.60 : x
2. Step 2: Convert to fraction form
   2,620.48/3,615.78 = 1,558.60/x
3. Step 3: Cross multiply
   2,620.48x = 3,615.78 × 1,558.60
4. Step 4: Simplify right side
   2,620.48x = 5,635,554.71
5. Step 5: Solve for x
   x = 5,635,554.71/2,620.48
6. Step 6: Final answer
   x = 2,150.58