Finding the Fourth Proportional to 1,013.61, 1,398.69 and 571.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.61 : 1,398.69 = 571.43 : x
2. Step 2: Convert to fraction form
   1,013.61/1,398.69 = 571.43/x
3. Step 3: Cross multiply
   1,013.61x = 1,398.69 × 571.43
4. Step 4: Simplify right side
   1,013.61x = 799,254.60
5. Step 5: Solve for x
   x = 799,254.60/1,013.61
6. Step 6: Final answer
   x = 788.52