Finding the Fourth Proportional to 1,012.88, 1,397.94 and 570.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.88 : 1,397.94 = 570.92 : x
2. Step 2: Convert to fraction form
   1,012.88/1,397.94 = 570.92/x
3. Step 3: Cross multiply
   1,012.88x = 1,397.94 × 570.92
4. Step 4: Simplify right side
   1,012.88x = 798,111.90
5. Step 5: Solve for x
   x = 798,111.90/1,012.88
6. Step 6: Final answer
   x = 787.96