Finding the Fourth Proportional to 1,722.56, 2,583.78 and 845.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,722.56 : 2,583.78 = 845.72 : x
2. Step 2: Convert to fraction form
   1,722.56/2,583.78 = 845.72/x
3. Step 3: Cross multiply
   1,722.56x = 2,583.78 × 845.72
4. Step 4: Simplify right side
   1,722.56x = 2,185,154.42
5. Step 5: Solve for x
   x = 2,185,154.42/1,722.56
6. Step 6: Final answer
   x = 1,268.55