Finding the Fourth Proportional to 1,643.72, 2,466.79 and 1,322.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.72 : 2,466.79 = 1,322.96 : x
2. Step 2: Convert to fraction form
   1,643.72/2,466.79 = 1,322.96/x
3. Step 3: Cross multiply
   1,643.72x = 2,466.79 × 1,322.96
4. Step 4: Simplify right side
   1,643.72x = 3,263,448.86
5. Step 5: Solve for x
   x = 3,263,448.86/1,643.72
6. Step 6: Final answer
   x = 1,985.41