Finding the Fourth Proportional to 2,111.42, 3,166.05 and 1,124.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.42 : 3,166.05 = 1,124.80 : x
2. Step 2: Convert to fraction form
   2,111.42/3,166.05 = 1,124.80/x
3. Step 3: Cross multiply
   2,111.42x = 3,166.05 × 1,124.80
4. Step 4: Simplify right side
   2,111.42x = 3,561,173.04
5. Step 5: Solve for x
   x = 3,561,173.04/2,111.42
6. Step 6: Final answer
   x = 1,686.62