Finding the Fourth Proportional to 1,059.78, 1,588.58 and 443.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.78 : 1,588.58 = 443.84 : x
2. Step 2: Convert to fraction form
   1,059.78/1,588.58 = 443.84/x
3. Step 3: Cross multiply
   1,059.78x = 1,588.58 × 443.84
4. Step 4: Simplify right side
   1,059.78x = 705,075.35
5. Step 5: Solve for x
   x = 705,075.35/1,059.78
6. Step 6: Final answer
   x = 665.30