Finding the Fourth Proportional to 1,086.99, 1,629.32 and 437.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.99 : 1,629.32 = 437.55 : x
2. Step 2: Convert to fraction form
   1,086.99/1,629.32 = 437.55/x
3. Step 3: Cross multiply
   1,086.99x = 1,629.32 × 437.55
4. Step 4: Simplify right side
   1,086.99x = 712,906.78
5. Step 5: Solve for x
   x = 712,906.78/1,086.99
6. Step 6: Final answer
   x = 655.85