Finding the Fourth Proportional to 1,013.55, 1,398.69 and 571.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.55 : 1,398.69 = 571.46 : x
2. Step 2: Convert to fraction form
   1,013.55/1,398.69 = 571.46/x
3. Step 3: Cross multiply
   1,013.55x = 1,398.69 × 571.46
4. Step 4: Simplify right side
   1,013.55x = 799,288.39
5. Step 5: Solve for x
   x = 799,288.39/1,013.55
6. Step 6: Final answer
   x = 788.60