Finding the Fourth Proportional to 2,111.96, 3,145.67 and 2,017.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.96 : 3,145.67 = 2,017.20 : x
2. Step 2: Convert to fraction form
   2,111.96/3,145.67 = 2,017.20/x
3. Step 3: Cross multiply
   2,111.96x = 3,145.67 × 2,017.20
4. Step 4: Simplify right side
   2,111.96x = 6,345,445.52
5. Step 5: Solve for x
   x = 6,345,445.52/2,111.96
6. Step 6: Final answer
   x = 3,004.53