Finding the Fourth Proportional to 1,443.68, 1,991.64 and 1,002.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.68 : 1,991.64 = 1,002.64 : x
2. Step 2: Convert to fraction form
   1,443.68/1,991.64 = 1,002.64/x
3. Step 3: Cross multiply
   1,443.68x = 1,991.64 × 1,002.64
4. Step 4: Simplify right side
   1,443.68x = 1,996,897.93
5. Step 5: Solve for x
   x = 1,996,897.93/1,443.68
6. Step 6: Final answer
   x = 1,383.20