Finding the Fourth Proportional to 1,012.49, 1,397.22 and 570.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.49 : 1,397.22 = 570.39 : x
2. Step 2: Convert to fraction form
   1,012.49/1,397.22 = 570.39/x
3. Step 3: Cross multiply
   1,012.49x = 1,397.22 × 570.39
4. Step 4: Simplify right side
   1,012.49x = 796,960.32
5. Step 5: Solve for x
   x = 796,960.32/1,012.49
6. Step 6: Final answer
   x = 787.13