Finding the Fourth Proportional to 3,699.76, 5,105.56 and 2,128.08

Step by Step Solution

1. Step 1: Write the proportion equation
   3,699.76 : 5,105.56 = 2,128.08 : x
2. Step 2: Convert to fraction form
   3,699.76/5,105.56 = 2,128.08/x
3. Step 3: Cross multiply
   3,699.76x = 5,105.56 × 2,128.08
4. Step 4: Simplify right side
   3,699.76x = 10,865,040.12
5. Step 5: Solve for x
   x = 10,865,040.12/3,699.76
6. Step 6: Final answer
   x = 2,936.69