Finding the Fourth Proportional to 2,111.75, 3,173.70 and 2,099.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.75 : 3,173.70 = 2,099.60 : x
2. Step 2: Convert to fraction form
   2,111.75/3,173.70 = 2,099.60/x
3. Step 3: Cross multiply
   2,111.75x = 3,173.70 × 2,099.60
4. Step 4: Simplify right side
   2,111.75x = 6,663,500.52
5. Step 5: Solve for x
   x = 6,663,500.52/2,111.75
6. Step 6: Final answer
   x = 3,155.44