Finding the Fourth Proportional to 2,889.96, 3,977.55 and 2,515.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,889.96 : 3,977.55 = 2,515.20 : x
2. Step 2: Convert to fraction form
   2,889.96/3,977.55 = 2,515.20/x
3. Step 3: Cross multiply
   2,889.96x = 3,977.55 × 2,515.20
4. Step 4: Simplify right side
   2,889.96x = 10,004,333.76
5. Step 5: Solve for x
   x = 10,004,333.76/2,889.96
6. Step 6: Final answer
   x = 3,461.76