Finding the Fourth Proportional to 1,217.86, 1,825.83 and 1,086.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217.86 : 1,825.83 = 1,086.34 : x
2. Step 2: Convert to fraction form
   1,217.86/1,825.83 = 1,086.34/x
3. Step 3: Cross multiply
   1,217.86x = 1,825.83 × 1,086.34
4. Step 4: Simplify right side
   1,217.86x = 1,983,472.16
5. Step 5: Solve for x
   x = 1,983,472.16/1,217.86
6. Step 6: Final answer
   x = 1,628.65