Finding the Fourth Proportional to 1,047.76, 1,570.72 and 398.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.76 : 1,570.72 = 398.06 : x
2. Step 2: Convert to fraction form
   1,047.76/1,570.72 = 398.06/x
3. Step 3: Cross multiply
   1,047.76x = 1,570.72 × 398.06
4. Step 4: Simplify right side
   1,047.76x = 625,240.80
5. Step 5: Solve for x
   x = 625,240.80/1,047.76
6. Step 6: Final answer
   x = 596.74