Finding the Fourth Proportional to 1,150.31, 1,725.74 and 380.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.31 : 1,725.74 = 380.81 : x
2. Step 2: Convert to fraction form
   1,150.31/1,725.74 = 380.81/x
3. Step 3: Cross multiply
   1,150.31x = 1,725.74 × 380.81
4. Step 4: Simplify right side
   1,150.31x = 657,182.89
5. Step 5: Solve for x
   x = 657,182.89/1,150.31
6. Step 6: Final answer
   x = 571.31