Finding the Fourth Proportional to 3,705.94, 5,108.83 and 2,820.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,705.94 : 5,108.83 = 2,820.21 : x
2. Step 2: Convert to fraction form
   3,705.94/5,108.83 = 2,820.21/x
3. Step 3: Cross multiply
   3,705.94x = 5,108.83 × 2,820.21
4. Step 4: Simplify right side
   3,705.94x = 14,407,973.45
5. Step 5: Solve for x
   x = 14,407,973.45/3,705.94
6. Step 6: Final answer
   x = 3,887.81