Finding the Fourth Proportional to 1,047.33, 1,570.35 and 398.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.33 : 1,570.35 = 398.10 : x
2. Step 2: Convert to fraction form
   1,047.33/1,570.35 = 398.10/x
3. Step 3: Cross multiply
   1,047.33x = 1,570.35 × 398.10
4. Step 4: Simplify right side
   1,047.33x = 625,156.34
5. Step 5: Solve for x
   x = 625,156.34/1,047.33
6. Step 6: Final answer
   x = 596.90