Finding the Fourth Proportional to 2,855.32, 3,940.50 and 1,971.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,855.32 : 3,940.50 = 1,971.52 : x
2. Step 2: Convert to fraction form
   2,855.32/3,940.50 = 1,971.52/x
3. Step 3: Cross multiply
   2,855.32x = 3,940.50 × 1,971.52
4. Step 4: Simplify right side
   2,855.32x = 7,768,774.56
5. Step 5: Solve for x
   x = 7,768,774.56/2,855.32
6. Step 6: Final answer
   x = 2,720.81