Finding the Fourth Proportional to 1,321.07, 1,823.10 and 731.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.07 : 1,823.10 = 731.57 : x
2. Step 2: Convert to fraction form
   1,321.07/1,823.10 = 731.57/x
3. Step 3: Cross multiply
   1,321.07x = 1,823.10 × 731.57
4. Step 4: Simplify right side
   1,321.07x = 1,333,725.27
5. Step 5: Solve for x
   x = 1,333,725.27/1,321.07
6. Step 6: Final answer
   x = 1,009.58