Finding the Fourth Proportional to 1,645.83, 2,271.96 and 1,086.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.83 : 2,271.96 = 1,086.57 : x
2. Step 2: Convert to fraction form
   1,645.83/2,271.96 = 1,086.57/x
3. Step 3: Cross multiply
   1,645.83x = 2,271.96 × 1,086.57
4. Step 4: Simplify right side
   1,645.83x = 2,468,643.58
5. Step 5: Solve for x
   x = 2,468,643.58/1,645.83
6. Step 6: Final answer
   x = 1,499.94