Finding the Fourth Proportional to 1,392.16, 1,920.27 and 867.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.16 : 1,920.27 = 867.82 : x
2. Step 2: Convert to fraction form
   1,392.16/1,920.27 = 867.82/x
3. Step 3: Cross multiply
   1,392.16x = 1,920.27 × 867.82
4. Step 4: Simplify right side
   1,392.16x = 1,666,448.71
5. Step 5: Solve for x
   x = 1,666,448.71/1,392.16
6. Step 6: Final answer
   x = 1,197.02