Finding the Fourth Proportional to 1,012.34, 1,397.12 and 570.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.34 : 1,397.12 = 570.33 : x
2. Step 2: Convert to fraction form
   1,012.34/1,397.12 = 570.33/x
3. Step 3: Cross multiply
   1,012.34x = 1,397.12 × 570.33
4. Step 4: Simplify right side
   1,012.34x = 796,815.84
5. Step 5: Solve for x
   x = 796,815.84/1,012.34
6. Step 6: Final answer
   x = 787.10