Finding the Fourth Proportional to 2,162.07, 3,240.40 and 928.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,162.07 : 3,240.40 = 928.05 : x
2. Step 2: Convert to fraction form
   2,162.07/3,240.40 = 928.05/x
3. Step 3: Cross multiply
   2,162.07x = 3,240.40 × 928.05
4. Step 4: Simplify right side
   2,162.07x = 3,007,253.22
5. Step 5: Solve for x
   x = 3,007,253.22/2,162.07
6. Step 6: Final answer
   x = 1,390.91