Finding the Fourth Proportional to 1,643.40, 2,266.61 and 1,053.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.40 : 2,266.61 = 1,053.98 : x
2. Step 2: Convert to fraction form
   1,643.40/2,266.61 = 1,053.98/x
3. Step 3: Cross multiply
   1,643.40x = 2,266.61 × 1,053.98
4. Step 4: Simplify right side
   1,643.40x = 2,388,961.61
5. Step 5: Solve for x
   x = 2,388,961.61/1,643.40
6. Step 6: Final answer
   x = 1,453.67