Finding the Fourth Proportional to 1,049.34, 1,572.38 and 399.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,049.34 : 1,572.38 = 399.72 : x
2. Step 2: Convert to fraction form
   1,049.34/1,572.38 = 399.72/x
3. Step 3: Cross multiply
   1,049.34x = 1,572.38 × 399.72
4. Step 4: Simplify right side
   1,049.34x = 628,511.73
5. Step 5: Solve for x
   x = 628,511.73/1,049.34
6. Step 6: Final answer
   x = 598.96