Finding the Fourth Proportional to 2,328.56, 3,213.72 and 1,397.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,328.56 : 3,213.72 = 1,397.12 : x
2. Step 2: Convert to fraction form
   2,328.56/3,213.72 = 1,397.12/x
3. Step 3: Cross multiply
   2,328.56x = 3,213.72 × 1,397.12
4. Step 4: Simplify right side
   2,328.56x = 4,489,952.49
5. Step 5: Solve for x
   x = 4,489,952.49/2,328.56
6. Step 6: Final answer
   x = 1,928.21