Finding the Fourth Proportional to 2,085.48, 3,128.06 and 1,264.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.48 : 3,128.06 = 1,264.12 : x
2. Step 2: Convert to fraction form
   2,085.48/3,128.06 = 1,264.12/x
3. Step 3: Cross multiply
   2,085.48x = 3,128.06 × 1,264.12
4. Step 4: Simplify right side
   2,085.48x = 3,954,243.21
5. Step 5: Solve for x
   x = 3,954,243.21/2,085.48
6. Step 6: Final answer
   x = 1,896.08