Finding the Fourth Proportional to 1,441.72, 1,988.28 and 993.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.72 : 1,988.28 = 993.36 : x
2. Step 2: Convert to fraction form
   1,441.72/1,988.28 = 993.36/x
3. Step 3: Cross multiply
   1,441.72x = 1,988.28 × 993.36
4. Step 4: Simplify right side
   1,441.72x = 1,975,077.82
5. Step 5: Solve for x
   x = 1,975,077.82/1,441.72
6. Step 6: Final answer
   x = 1,369.95