Finding the Fourth Proportional to 1,086.81, 1,630.21 and 493.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.81 : 1,630.21 = 493.89 : x
2. Step 2: Convert to fraction form
   1,086.81/1,630.21 = 493.89/x
3. Step 3: Cross multiply
   1,086.81x = 1,630.21 × 493.89
4. Step 4: Simplify right side
   1,086.81x = 805,144.42
5. Step 5: Solve for x
   x = 805,144.42/1,086.81
6. Step 6: Final answer
   x = 740.83