Finding the Fourth Proportional to 2,111.10, 2,960.40 and 2,111.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.10 : 2,960.40 = 2,111.10 : x
2. Step 2: Convert to fraction form
   2,111.10/2,960.40 = 2,111.10/x
3. Step 3: Cross multiply
   2,111.10x = 2,960.40 × 2,111.10
4. Step 4: Simplify right side
   2,111.10x = 6,249,700.44
5. Step 5: Solve for x
   x = 6,249,700.44/2,111.10
6. Step 6: Final answer
   x = 2,960.40