Finding the Fourth Proportional to 1,722.72, 2,585.58 and 890.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,722.72 : 2,585.58 = 890.35 : x
2. Step 2: Convert to fraction form
   1,722.72/2,585.58 = 890.35/x
3. Step 3: Cross multiply
   1,722.72x = 2,585.58 × 890.35
4. Step 4: Simplify right side
   1,722.72x = 2,302,071.15
5. Step 5: Solve for x
   x = 2,302,071.15/1,722.72
6. Step 6: Final answer
   x = 1,336.30