Finding the Fourth Proportional to 3,764.42, 5,646.55 and 991.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,764.42 : 5,646.55 = 991.27 : x
2. Step 2: Convert to fraction form
   3,764.42/5,646.55 = 991.27/x
3. Step 3: Cross multiply
   3,764.42x = 5,646.55 × 991.27
4. Step 4: Simplify right side
   3,764.42x = 5,597,255.62
5. Step 5: Solve for x
   x = 5,597,255.62/3,764.42
6. Step 6: Final answer
   x = 1,486.88