Finding the Fourth Proportional to 1,321.55, 1,981.71 and 744.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.55 : 1,981.71 = 744.42 : x
2. Step 2: Convert to fraction form
   1,321.55/1,981.71 = 744.42/x
3. Step 3: Cross multiply
   1,321.55x = 1,981.71 × 744.42
4. Step 4: Simplify right side
   1,321.55x = 1,475,224.56
5. Step 5: Solve for x
   x = 1,475,224.56/1,321.55
6. Step 6: Final answer
   x = 1,116.28