Finding the Fourth Proportional to 1,086.49, 1,628.56 and 437.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.49 : 1,628.56 = 437.05 : x
2. Step 2: Convert to fraction form
   1,086.49/1,628.56 = 437.05/x
3. Step 3: Cross multiply
   1,086.49x = 1,628.56 × 437.05
4. Step 4: Simplify right side
   1,086.49x = 711,762.15
5. Step 5: Solve for x
   x = 711,762.15/1,086.49
6. Step 6: Final answer
   x = 655.10