Finding the Fourth Proportional to 3,693.78, 5,097.42 and 2,121.75

Step by Step Solution

1. Step 1: Write the proportion equation
   3,693.78 : 5,097.42 = 2,121.75 : x
2. Step 2: Convert to fraction form
   3,693.78/5,097.42 = 2,121.75/x
3. Step 3: Cross multiply
   3,693.78x = 5,097.42 × 2,121.75
4. Step 4: Simplify right side
   3,693.78x = 10,815,450.89
5. Step 5: Solve for x
   x = 10,815,450.89/3,693.78
6. Step 6: Final answer
   x = 2,928.02