Finding the Fourth Proportional to 1,013.46, 1,398.59 and 571.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.46 : 1,398.59 = 571.35 : x
2. Step 2: Convert to fraction form
   1,013.46/1,398.59 = 571.35/x
3. Step 3: Cross multiply
   1,013.46x = 1,398.59 × 571.35
4. Step 4: Simplify right side
   1,013.46x = 799,081.54
5. Step 5: Solve for x
   x = 799,081.54/1,013.46
6. Step 6: Final answer
   x = 788.47