Finding the Fourth Proportional to 1,315.89, 1,815.96 and 756.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.89 : 1,815.96 = 756.45 : x
2. Step 2: Convert to fraction form
   1,315.89/1,815.96 = 756.45/x
3. Step 3: Cross multiply
   1,315.89x = 1,815.96 × 756.45
4. Step 4: Simplify right side
   1,315.89x = 1,373,682.94
5. Step 5: Solve for x
   x = 1,373,682.94/1,315.89
6. Step 6: Final answer
   x = 1,043.92