Finding the Fourth Proportional to 2,087.19, 3,131.72 and 1,099.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.19 : 3,131.72 = 1,099.77 : x
2. Step 2: Convert to fraction form
   2,087.19/3,131.72 = 1,099.77/x
3. Step 3: Cross multiply
   2,087.19x = 3,131.72 × 1,099.77
4. Step 4: Simplify right side
   2,087.19x = 3,444,171.70
5. Step 5: Solve for x
   x = 3,444,171.70/2,087.19
6. Step 6: Final answer
   x = 1,650.15