Finding the Fourth Proportional to 2,620.89, 3,616.65 and 1,558.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.89 : 3,616.65 = 1,558.61 : x
2. Step 2: Convert to fraction form
   2,620.89/3,616.65 = 1,558.61/x
3. Step 3: Cross multiply
   2,620.89x = 3,616.65 × 1,558.61
4. Step 4: Simplify right side
   2,620.89x = 5,636,928.77
5. Step 5: Solve for x
   x = 5,636,928.77/2,620.89
6. Step 6: Final answer
   x = 2,150.77