Finding the Fourth Proportional to 1,381.92, 1,906.98 and 857.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.92 : 1,906.98 = 857.94 : x
2. Step 2: Convert to fraction form
   1,381.92/1,906.98 = 857.94/x
3. Step 3: Cross multiply
   1,381.92x = 1,906.98 × 857.94
4. Step 4: Simplify right side
   1,381.92x = 1,636,074.42
5. Step 5: Solve for x
   x = 1,636,074.42/1,381.92
6. Step 6: Final answer
   x = 1,183.91