Finding the Fourth Proportional to 2,080, 3,117.57 and 1,155.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080 : 3,117.57 = 1,155.12 : x
2. Step 2: Convert to fraction form
   2,080/3,117.57 = 1,155.12/x
3. Step 3: Cross multiply
   2,080x = 3,117.57 × 1,155.12
4. Step 4: Simplify right side
   2,080x = 3,601,167.46
5. Step 5: Solve for x
   x = 3,601,167.46/2,080
6. Step 6: Final answer
   x = 1,731.33