Finding the Fourth Proportional to 1,042.40, 1,438.50 and 570.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.40 : 1,438.50 = 570.27 : x
2. Step 2: Convert to fraction form
   1,042.40/1,438.50 = 570.27/x
3. Step 3: Cross multiply
   1,042.40x = 1,438.50 × 570.27
4. Step 4: Simplify right side
   1,042.40x = 820,333.40
5. Step 5: Solve for x
   x = 820,333.40/1,042.40
6. Step 6: Final answer
   x = 786.97