Finding the Fourth Proportional to 1,124.70, 1,680.37 and 1,086.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,124.70 : 1,680.37 = 1,086.42 : x
2. Step 2: Convert to fraction form
   1,124.70/1,680.37 = 1,086.42/x
3. Step 3: Cross multiply
   1,124.70x = 1,680.37 × 1,086.42
4. Step 4: Simplify right side
   1,124.70x = 1,825,587.58
5. Step 5: Solve for x
   x = 1,825,587.58/1,124.70
6. Step 6: Final answer
   x = 1,623.18