Finding the Fourth Proportional to 2,127.56, 3,186.72 and 1,085.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,127.56 : 3,186.72 = 1,085.78 : x
2. Step 2: Convert to fraction form
   2,127.56/3,186.72 = 1,085.78/x
3. Step 3: Cross multiply
   2,127.56x = 3,186.72 × 1,085.78
4. Step 4: Simplify right side
   2,127.56x = 3,460,076.84
5. Step 5: Solve for x
   x = 3,460,076.84/2,127.56
6. Step 6: Final answer
   x = 1,626.31