Finding the Fourth Proportional to 3,806.79, 5,253.51 and 2,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,806.79 : 5,253.51 = 2,128.50 : x
2. Step 2: Convert to fraction form
   3,806.79/5,253.51 = 2,128.50/x
3. Step 3: Cross multiply
   3,806.79x = 5,253.51 × 2,128.50
4. Step 4: Simplify right side
   3,806.79x = 11,182,096.04
5. Step 5: Solve for x
   x = 11,182,096.04/3,806.79
6. Step 6: Final answer
   x = 2,937.41