Finding the Fourth Proportional to 3,407.32, 5,111.57 and 1,328.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,407.32 : 5,111.57 = 1,328.45 : x
2. Step 2: Convert to fraction form
   3,407.32/5,111.57 = 1,328.45/x
3. Step 3: Cross multiply
   3,407.32x = 5,111.57 × 1,328.45
4. Step 4: Simplify right side
   3,407.32x = 6,790,458.52
5. Step 5: Solve for x
   x = 6,790,458.52/3,407.32
6. Step 6: Final answer
   x = 1,992.91