Finding the Fourth Proportional to 1,392.53, 1,921.37 and 832.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.53 : 1,921.37 = 832.91 : x
2. Step 2: Convert to fraction form
   1,392.53/1,921.37 = 832.91/x
3. Step 3: Cross multiply
   1,392.53x = 1,921.37 × 832.91
4. Step 4: Simplify right side
   1,392.53x = 1,600,314.52
5. Step 5: Solve for x
   x = 1,600,314.52/1,392.53
6. Step 6: Final answer
   x = 1,149.22