Finding the Fourth Proportional to 3,891.88, 5,370.72 and 2,123.48

Step by Step Solution

1. Step 1: Write the proportion equation
   3,891.88 : 5,370.72 = 2,123.48 : x
2. Step 2: Convert to fraction form
   3,891.88/5,370.72 = 2,123.48/x
3. Step 3: Cross multiply
   3,891.88x = 5,370.72 × 2,123.48
4. Step 4: Simplify right side
   3,891.88x = 11,404,616.51
5. Step 5: Solve for x
   x = 11,404,616.51/3,891.88
6. Step 6: Final answer
   x = 2,930.36