Finding the Fourth Proportional to 1,012.77, 1,397.50 and 570.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.77 : 1,397.50 = 570.71 : x
2. Step 2: Convert to fraction form
   1,012.77/1,397.50 = 570.71/x
3. Step 3: Cross multiply
   1,012.77x = 1,397.50 × 570.71
4. Step 4: Simplify right side
   1,012.77x = 797,567.23
5. Step 5: Solve for x
   x = 797,567.23/1,012.77
6. Step 6: Final answer
   x = 787.51