Finding the Fourth Proportional to 1,513.37, 2,274.15 and 820.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,513.37 : 2,274.15 = 820.55 : x
2. Step 2: Convert to fraction form
   1,513.37/2,274.15 = 820.55/x
3. Step 3: Cross multiply
   1,513.37x = 2,274.15 × 820.55
4. Step 4: Simplify right side
   1,513.37x = 1,866,053.78
5. Step 5: Solve for x
   x = 1,866,053.78/1,513.37
6. Step 6: Final answer
   x = 1,233.05