Finding the Fourth Proportional to 1,047.49, 1,570.33 and 398.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.49 : 1,570.33 = 398.69 : x
2. Step 2: Convert to fraction form
   1,047.49/1,570.33 = 398.69/x
3. Step 3: Cross multiply
   1,047.49x = 1,570.33 × 398.69
4. Step 4: Simplify right side
   1,047.49x = 626,065.02
5. Step 5: Solve for x
   x = 626,065.02/1,047.49
6. Step 6: Final answer
   x = 597.68