Finding the Fourth Proportional to 1,916.42, 2,643.89 and 1,208.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,916.42 : 2,643.89 = 1,208.03 : x
2. Step 2: Convert to fraction form
   1,916.42/2,643.89 = 1,208.03/x
3. Step 3: Cross multiply
   1,916.42x = 2,643.89 × 1,208.03
4. Step 4: Simplify right side
   1,916.42x = 3,193,879.18
5. Step 5: Solve for x
   x = 3,193,879.18/1,916.42
6. Step 6: Final answer
   x = 1,666.59