Finding the Fourth Proportional to 3,453.31, 4,766.48 and 2,128.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,453.31 : 4,766.48 = 2,128.12 : x
2. Step 2: Convert to fraction form
   3,453.31/4,766.48 = 2,128.12/x
3. Step 3: Cross multiply
   3,453.31x = 4,766.48 × 2,128.12
4. Step 4: Simplify right side
   3,453.31x = 10,143,641.42
5. Step 5: Solve for x
   x = 10,143,641.42/3,453.31
6. Step 6: Final answer
   x = 2,937.37