Finding the Fourth Proportional to 2,128.19, 3,192.31 and 1,085.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.19 : 3,192.31 = 1,085.24 : x
2. Step 2: Convert to fraction form
   2,128.19/3,192.31 = 1,085.24/x
3. Step 3: Cross multiply
   2,128.19x = 3,192.31 × 1,085.24
4. Step 4: Simplify right side
   2,128.19x = 3,464,431.84
5. Step 5: Solve for x
   x = 3,464,431.84/2,128.19
6. Step 6: Final answer
   x = 1,627.88