Finding the Fourth Proportional to 1,012.47, 1,397.22 and 570.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.47 : 1,397.22 = 570.42 : x
2. Step 2: Convert to fraction form
   1,012.47/1,397.22 = 570.42/x
3. Step 3: Cross multiply
   1,012.47x = 1,397.22 × 570.42
4. Step 4: Simplify right side
   1,012.47x = 797,002.23
5. Step 5: Solve for x
   x = 797,002.23/1,012.47
6. Step 6: Final answer
   x = 787.19