Finding the Fourth Proportional to 1,389.32, 2,079.38 and 867.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.32 : 2,079.38 = 867.54 : x
2. Step 2: Convert to fraction form
   1,389.32/2,079.38 = 867.54/x
3. Step 3: Cross multiply
   1,389.32x = 2,079.38 × 867.54
4. Step 4: Simplify right side
   1,389.32x = 1,803,945.33
5. Step 5: Solve for x
   x = 1,803,945.33/1,389.32
6. Step 6: Final answer
   x = 1,298.44