Finding the Fourth Proportional to 1,643.40, 2,266.42 and 1,053.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.40 : 2,266.42 = 1,053.82 : x
2. Step 2: Convert to fraction form
   1,643.40/2,266.42 = 1,053.82/x
3. Step 3: Cross multiply
   1,643.40x = 2,266.42 × 1,053.82
4. Step 4: Simplify right side
   1,643.40x = 2,388,398.72
5. Step 5: Solve for x
   x = 2,388,398.72/1,643.40
6. Step 6: Final answer
   x = 1,453.33