Finding the Fourth Proportional to 2,555.15, 3,523.94 and 2,158.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,555.15 : 3,523.94 = 2,158.76 : x
2. Step 2: Convert to fraction form
   2,555.15/3,523.94 = 2,158.76/x
3. Step 3: Cross multiply
   2,555.15x = 3,523.94 × 2,158.76
4. Step 4: Simplify right side
   2,555.15x = 7,607,312.30
5. Step 5: Solve for x
   x = 7,607,312.30/2,555.15
6. Step 6: Final answer
   x = 2,977.25