Finding the Fourth Proportional to 1,046.31, 1,570.14 and 815.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,046.31 : 1,570.14 = 815.65 : x
2. Step 2: Convert to fraction form
   1,046.31/1,570.14 = 815.65/x
3. Step 3: Cross multiply
   1,046.31x = 1,570.14 × 815.65
4. Step 4: Simplify right side
   1,046.31x = 1,280,684.69
5. Step 5: Solve for x
   x = 1,280,684.69/1,046.31
6. Step 6: Final answer
   x = 1,224.00