Finding the Fourth Proportional to 2,511.38, 3,465.43 and 1,392.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,511.38 : 3,465.43 = 1,392.05 : x
2. Step 2: Convert to fraction form
   2,511.38/3,465.43 = 1,392.05/x
3. Step 3: Cross multiply
   2,511.38x = 3,465.43 × 1,392.05
4. Step 4: Simplify right side
   2,511.38x = 4,824,057.01
5. Step 5: Solve for x
   x = 4,824,057.01/2,511.38
6. Step 6: Final answer
   x = 1,920.88