Finding the Fourth Proportional to 3,878.00, 5,351.74 and 2,109.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,878.00 : 5,351.74 = 2,109.72 : x
2. Step 2: Convert to fraction form
   3,878.00/5,351.74 = 2,109.72/x
3. Step 3: Cross multiply
   3,878.00x = 5,351.74 × 2,109.72
4. Step 4: Simplify right side
   3,878.00x = 11,290,667.64
5. Step 5: Solve for x
   x = 11,290,667.64/3,878.00
6. Step 6: Final answer
   x = 2,911.47