Finding the Fourth Proportional to 1,012.67, 1,397.39 and 570.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.67 : 1,397.39 = 570.51 : x
2. Step 2: Convert to fraction form
   1,012.67/1,397.39 = 570.51/x
3. Step 3: Cross multiply
   1,012.67x = 1,397.39 × 570.51
4. Step 4: Simplify right side
   1,012.67x = 797,222.12
5. Step 5: Solve for x
   x = 797,222.12/1,012.67
6. Step 6: Final answer
   x = 787.25