Finding the Fourth Proportional to 2,105.13, 3,155.55 and 873.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.13 : 3,155.55 = 873.21 : x
2. Step 2: Convert to fraction form
   2,105.13/3,155.55 = 873.21/x
3. Step 3: Cross multiply
   2,105.13x = 3,155.55 × 873.21
4. Step 4: Simplify right side
   2,105.13x = 2,755,457.82
5. Step 5: Solve for x
   x = 2,755,457.82/2,105.13
6. Step 6: Final answer
   x = 1,308.93