Finding the Fourth Proportional to 1,037.56, 1,431.72 and 571.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,037.56 : 1,431.72 = 571.72 : x
2. Step 2: Convert to fraction form
   1,037.56/1,431.72 = 571.72/x
3. Step 3: Cross multiply
   1,037.56x = 1,431.72 × 571.72
4. Step 4: Simplify right side
   1,037.56x = 818,542.96
5. Step 5: Solve for x
   x = 818,542.96/1,037.56
6. Step 6: Final answer
   x = 788.91