Finding the Fourth Proportional to 2,111.80, 2,913.24 and 1,669

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.80 : 2,913.24 = 1,669 : x
2. Step 2: Convert to fraction form
   2,111.80/2,913.24 = 1,669/x
3. Step 3: Cross multiply
   2,111.80x = 2,913.24 × 1,669
4. Step 4: Simplify right side
   2,111.80x = 4,862,197.56
5. Step 5: Solve for x
   x = 4,862,197.56/2,111.80
6. Step 6: Final answer
   x = 2,302.39