Finding the Fourth Proportional to 2,620.39, 3,616.31 and 1,557.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.39 : 3,616.31 = 1,557.87 : x
2. Step 2: Convert to fraction form
   2,620.39/3,616.31 = 1,557.87/x
3. Step 3: Cross multiply
   2,620.39x = 3,616.31 × 1,557.87
4. Step 4: Simplify right side
   2,620.39x = 5,633,740.86
5. Step 5: Solve for x
   x = 5,633,740.86/2,620.39
6. Step 6: Final answer
   x = 2,149.96