Finding the Fourth Proportional to 1,012.53, 1,397.28 and 570.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.53 : 1,397.28 = 570.43 : x
2. Step 2: Convert to fraction form
   1,012.53/1,397.28 = 570.43/x
3. Step 3: Cross multiply
   1,012.53x = 1,397.28 × 570.43
4. Step 4: Simplify right side
   1,012.53x = 797,046.94
5. Step 5: Solve for x
   x = 797,046.94/1,012.53
6. Step 6: Final answer
   x = 787.18