Finding the Fourth Proportional to 2,111.90, 3,168.99 and 880.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.90 : 3,168.99 = 880.16 : x
2. Step 2: Convert to fraction form
   2,111.90/3,168.99 = 880.16/x
3. Step 3: Cross multiply
   2,111.90x = 3,168.99 × 880.16
4. Step 4: Simplify right side
   2,111.90x = 2,789,218.24
5. Step 5: Solve for x
   x = 2,789,218.24/2,111.90
6. Step 6: Final answer
   x = 1,320.72