Finding the Fourth Proportional to 2,124.61, 3,188.86 and 1,085.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,124.61 : 3,188.86 = 1,085.36 : x
2. Step 2: Convert to fraction form
   2,124.61/3,188.86 = 1,085.36/x
3. Step 3: Cross multiply
   2,124.61x = 3,188.86 × 1,085.36
4. Step 4: Simplify right side
   2,124.61x = 3,461,042.43
5. Step 5: Solve for x
   x = 3,461,042.43/2,124.61
6. Step 6: Final answer
   x = 1,629.03