Finding the Fourth Proportional to 2,056.72, 3,085.70 and 961.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,056.72 : 3,085.70 = 961.72 : x
2. Step 2: Convert to fraction form
   2,056.72/3,085.70 = 961.72/x
3. Step 3: Cross multiply
   2,056.72x = 3,085.70 × 961.72
4. Step 4: Simplify right side
   2,056.72x = 2,967,579.40
5. Step 5: Solve for x
   x = 2,967,579.40/2,056.72
6. Step 6: Final answer
   x = 1,442.87