Finding the Fourth Proportional to 2,811.72, 3,881.12 and 1,928.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,811.72 : 3,881.12 = 1,928.84 : x
2. Step 2: Convert to fraction form
   2,811.72/3,881.12 = 1,928.84/x
3. Step 3: Cross multiply
   2,811.72x = 3,881.12 × 1,928.84
4. Step 4: Simplify right side
   2,811.72x = 7,486,059.50
5. Step 5: Solve for x
   x = 7,486,059.50/2,811.72
6. Step 6: Final answer
   x = 2,662.45