Finding the Fourth Proportional to 3,747.78, 5,171.89 and 2,154.51

Step by Step Solution

1. Step 1: Write the proportion equation
   3,747.78 : 5,171.89 = 2,154.51 : x
2. Step 2: Convert to fraction form
   3,747.78/5,171.89 = 2,154.51/x
3. Step 3: Cross multiply
   3,747.78x = 5,171.89 × 2,154.51
4. Step 4: Simplify right side
   3,747.78x = 11,142,888.72
5. Step 5: Solve for x
   x = 11,142,888.72/3,747.78
6. Step 6: Final answer
   x = 2,973.20