Finding the Fourth Proportional to 1,086.48, 1,629.72 and 437.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.48 : 1,629.72 = 437.06 : x
2. Step 2: Convert to fraction form
   1,086.48/1,629.72 = 437.06/x
3. Step 3: Cross multiply
   1,086.48x = 1,629.72 × 437.06
4. Step 4: Simplify right side
   1,086.48x = 712,289.50
5. Step 5: Solve for x
   x = 712,289.50/1,086.48
6. Step 6: Final answer
   x = 655.59