Finding the Fourth Proportional to 1,158.72, 1,725.51 and 1,155.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.72 : 1,725.51 = 1,155.48 : x
2. Step 2: Convert to fraction form
   1,158.72/1,725.51 = 1,155.48/x
3. Step 3: Cross multiply
   1,158.72x = 1,725.51 × 1,155.48
4. Step 4: Simplify right side
   1,158.72x = 1,993,792.29
5. Step 5: Solve for x
   x = 1,993,792.29/1,158.72
6. Step 6: Final answer
   x = 1,720.69