Finding the Fourth Proportional to 1,315.69, 1,815.61 and 756.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.69 : 1,815.61 = 756.18 : x
2. Step 2: Convert to fraction form
   1,315.69/1,815.61 = 756.18/x
3. Step 3: Cross multiply
   1,315.69x = 1,815.61 × 756.18
4. Step 4: Simplify right side
   1,315.69x = 1,372,927.97
5. Step 5: Solve for x
   x = 1,372,927.97/1,315.69
6. Step 6: Final answer
   x = 1,043.50