Finding the Fourth Proportional to 2,126.17, 3,189.59 and 1,085.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,126.17 : 3,189.59 = 1,085.61 : x
2. Step 2: Convert to fraction form
   2,126.17/3,189.59 = 1,085.61/x
3. Step 3: Cross multiply
   2,126.17x = 3,189.59 × 1,085.61
4. Step 4: Simplify right side
   2,126.17x = 3,462,653.96
5. Step 5: Solve for x
   x = 3,462,653.96/2,126.17
6. Step 6: Final answer
   x = 1,628.58