Finding the Fourth Proportional to 1,013.34, 1,398.39 and 571.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.34 : 1,398.39 = 571.25 : x
2. Step 2: Convert to fraction form
   1,013.34/1,398.39 = 571.25/x
3. Step 3: Cross multiply
   1,013.34x = 1,398.39 × 571.25
4. Step 4: Simplify right side
   1,013.34x = 798,823.30
5. Step 5: Solve for x
   x = 798,823.30/1,013.34
6. Step 6: Final answer
   x = 788.31