Finding the Fourth Proportional to 1,087.63, 1,630.53 and 438.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.63 : 1,630.53 = 438.82 : x
2. Step 2: Convert to fraction form
   1,087.63/1,630.53 = 438.82/x
3. Step 3: Cross multiply
   1,087.63x = 1,630.53 × 438.82
4. Step 4: Simplify right side
   1,087.63x = 715,505.10
5. Step 5: Solve for x
   x = 715,505.10/1,087.63
6. Step 6: Final answer
   x = 657.86