Finding the Fourth Proportional to 1,449.31, 2,172.05 and 756.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,449.31 : 2,172.05 = 756.57 : x
2. Step 2: Convert to fraction form
   1,449.31/2,172.05 = 756.57/x
3. Step 3: Cross multiply
   1,449.31x = 2,172.05 × 756.57
4. Step 4: Simplify right side
   1,449.31x = 1,643,297.54
5. Step 5: Solve for x
   x = 1,643,297.54/1,449.31
6. Step 6: Final answer
   x = 1,133.84