Finding the Fourth Proportional to 2,253.12, 3,108.72 and 1,321.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,253.12 : 3,108.72 = 1,321.12 : x
2. Step 2: Convert to fraction form
   2,253.12/3,108.72 = 1,321.12/x
3. Step 3: Cross multiply
   2,253.12x = 3,108.72 × 1,321.12
4. Step 4: Simplify right side
   2,253.12x = 4,106,992.17
5. Step 5: Solve for x
   x = 4,106,992.17/2,253.12
6. Step 6: Final answer
   x = 1,822.80