Finding the Fourth Proportional to 1,042.47, 1,438.59 and 570.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.47 : 1,438.59 = 570.36 : x
2. Step 2: Convert to fraction form
   1,042.47/1,438.59 = 570.36/x
3. Step 3: Cross multiply
   1,042.47x = 1,438.59 × 570.36
4. Step 4: Simplify right side
   1,042.47x = 820,514.19
5. Step 5: Solve for x
   x = 820,514.19/1,042.47
6. Step 6: Final answer
   x = 787.09