Finding the Fourth Proportional to 2,503.12, 3,454.32 and 1,399.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,503.12 : 3,454.32 = 1,399.12 : x
2. Step 2: Convert to fraction form
   2,503.12/3,454.32 = 1,399.12/x
3. Step 3: Cross multiply
   2,503.12x = 3,454.32 × 1,399.12
4. Step 4: Simplify right side
   2,503.12x = 4,833,008.20
5. Step 5: Solve for x
   x = 4,833,008.20/2,503.12
6. Step 6: Final answer
   x = 1,930.79