Finding the Fourth Proportional to 1,353.65, 1,866.36 and 1,118.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.65 : 1,866.36 = 1,118.55 : x
2. Step 2: Convert to fraction form
   1,353.65/1,866.36 = 1,118.55/x
3. Step 3: Cross multiply
   1,353.65x = 1,866.36 × 1,118.55
4. Step 4: Simplify right side
   1,353.65x = 2,087,616.98
5. Step 5: Solve for x
   x = 2,087,616.98/1,353.65
6. Step 6: Final answer
   x = 1,542.21