Finding the Fourth Proportional to 2,311.12, 3,188.56 and 1,427.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.12 : 3,188.56 = 1,427.12 : x
2. Step 2: Convert to fraction form
   2,311.12/3,188.56 = 1,427.12/x
3. Step 3: Cross multiply
   2,311.12x = 3,188.56 × 1,427.12
4. Step 4: Simplify right side
   2,311.12x = 4,550,457.75
5. Step 5: Solve for x
   x = 4,550,457.75/2,311.12
6. Step 6: Final answer
   x = 1,968.94