Finding the Fourth Proportional to 1,137.72, 1,568.88 and 837.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,137.72 : 1,568.88 = 837.60 : x
2. Step 2: Convert to fraction form
   1,137.72/1,568.88 = 837.60/x
3. Step 3: Cross multiply
   1,137.72x = 1,568.88 × 837.60
4. Step 4: Simplify right side
   1,137.72x = 1,314,093.89
5. Step 5: Solve for x
   x = 1,314,093.89/1,137.72
6. Step 6: Final answer
   x = 1,155.02