Finding the Fourth Proportional to 1,910.68, 2,860.90 and 1,087.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,910.68 : 2,860.90 = 1,087.72 : x
2. Step 2: Convert to fraction form
   1,910.68/2,860.90 = 1,087.72/x
3. Step 3: Cross multiply
   1,910.68x = 2,860.90 × 1,087.72
4. Step 4: Simplify right side
   1,910.68x = 3,111,858.15
5. Step 5: Solve for x
   x = 3,111,858.15/1,910.68
6. Step 6: Final answer
   x = 1,628.67