Finding the Fourth Proportional to 1,042.69, 1,438.89 and 570.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.69 : 1,438.89 = 570.59 : x
2. Step 2: Convert to fraction form
   1,042.69/1,438.89 = 570.59/x
3. Step 3: Cross multiply
   1,042.69x = 1,438.89 × 570.59
4. Step 4: Simplify right side
   1,042.69x = 821,016.25
5. Step 5: Solve for x
   x = 821,016.25/1,042.69
6. Step 6: Final answer
   x = 787.41