Finding the Fourth Proportional to 1,989.82, 2,986.55 and 1,066.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.82 : 2,986.55 = 1,066.42 : x
2. Step 2: Convert to fraction form
   1,989.82/2,986.55 = 1,066.42/x
3. Step 3: Cross multiply
   1,989.82x = 2,986.55 × 1,066.42
4. Step 4: Simplify right side
   1,989.82x = 3,184,916.65
5. Step 5: Solve for x
   x = 3,184,916.65/1,989.82
6. Step 6: Final answer
   x = 1,600.61