Finding the Fourth Proportional to 1,910.80, 2,860.72 and 1,087.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,910.80 : 2,860.72 = 1,087.12 : x
2. Step 2: Convert to fraction form
   1,910.80/2,860.72 = 1,087.12/x
3. Step 3: Cross multiply
   1,910.80x = 2,860.72 × 1,087.12
4. Step 4: Simplify right side
   1,910.80x = 3,109,945.93
5. Step 5: Solve for x
   x = 3,109,945.93/1,910.80
6. Step 6: Final answer
   x = 1,627.56