Finding the Fourth Proportional to 1,392.57, 1,921.16 and 832.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.57 : 1,921.16 = 832.86 : x
2. Step 2: Convert to fraction form
   1,392.57/1,921.16 = 832.86/x
3. Step 3: Cross multiply
   1,392.57x = 1,921.16 × 832.86
4. Step 4: Simplify right side
   1,392.57x = 1,600,053.15
5. Step 5: Solve for x
   x = 1,600,053.15/1,392.57
6. Step 6: Final answer
   x = 1,148.99