Finding the Fourth Proportional to 1,390.71, 1,919.17 and 893.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.71 : 1,919.17 = 893.54 : x
2. Step 2: Convert to fraction form
   1,390.71/1,919.17 = 893.54/x
3. Step 3: Cross multiply
   1,390.71x = 1,919.17 × 893.54
4. Step 4: Simplify right side
   1,390.71x = 1,714,855.16
5. Step 5: Solve for x
   x = 1,714,855.16/1,390.71
6. Step 6: Final answer
   x = 1,233.08