Finding the Fourth Proportional to 1,012.60, 1,397.42 and 570.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.60 : 1,397.42 = 570.52 : x
2. Step 2: Convert to fraction form
   1,012.60/1,397.42 = 570.52/x
3. Step 3: Cross multiply
   1,012.60x = 1,397.42 × 570.52
4. Step 4: Simplify right side
   1,012.60x = 797,250.78
5. Step 5: Solve for x
   x = 797,250.78/1,012.60
6. Step 6: Final answer
   x = 787.33