Finding the Fourth Proportional to 1,443.21, 1,991.18 and 883.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.21 : 1,991.18 = 883.10 : x
2. Step 2: Convert to fraction form
   1,443.21/1,991.18 = 883.10/x
3. Step 3: Cross multiply
   1,443.21x = 1,991.18 × 883.10
4. Step 4: Simplify right side
   1,443.21x = 1,758,398.34
5. Step 5: Solve for x
   x = 1,758,398.34/1,443.21
6. Step 6: Final answer
   x = 1,218.39