Finding the Fourth Proportional to 1,137.48, 1,569.78 and 671.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,137.48 : 1,569.78 = 671.72 : x
2. Step 2: Convert to fraction form
   1,137.48/1,569.78 = 671.72/x
3. Step 3: Cross multiply
   1,137.48x = 1,569.78 × 671.72
4. Step 4: Simplify right side
   1,137.48x = 1,054,452.62
5. Step 5: Solve for x
   x = 1,054,452.62/1,137.48
6. Step 6: Final answer
   x = 927.01