Finding the Fourth Proportional to 1,515.89, 2,274.15 and 865.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,515.89 : 2,274.15 = 865.28 : x
2. Step 2: Convert to fraction form
   1,515.89/2,274.15 = 865.28/x
3. Step 3: Cross multiply
   1,515.89x = 2,274.15 × 865.28
4. Step 4: Simplify right side
   1,515.89x = 1,967,776.51
5. Step 5: Solve for x
   x = 1,967,776.51/1,515.89
6. Step 6: Final answer
   x = 1,298.10