Finding the Fourth Proportional to 1,137.98, 1,707.42 and 488.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,137.98 : 1,707.42 = 488.72 : x
2. Step 2: Convert to fraction form
   1,137.98/1,707.42 = 488.72/x
3. Step 3: Cross multiply
   1,137.98x = 1,707.42 × 488.72
4. Step 4: Simplify right side
   1,137.98x = 834,450.30
5. Step 5: Solve for x
   x = 834,450.30/1,137.98
6. Step 6: Final answer
   x = 733.27