Finding the Fourth Proportional to 1,392.85, 2,094.09 and 1,120.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.85 : 2,094.09 = 1,120.83 : x
2. Step 2: Convert to fraction form
   1,392.85/2,094.09 = 1,120.83/x
3. Step 3: Cross multiply
   1,392.85x = 2,094.09 × 1,120.83
4. Step 4: Simplify right side
   1,392.85x = 2,347,118.89
5. Step 5: Solve for x
   x = 2,347,118.89/1,392.85
6. Step 6: Final answer
   x = 1,685.12