Finding the Fourth Proportional to 2,653.81, 3,650.08 and 2,128.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,653.81 : 3,650.08 = 2,128.69 : x
2. Step 2: Convert to fraction form
   2,653.81/3,650.08 = 2,128.69/x
3. Step 3: Cross multiply
   2,653.81x = 3,650.08 × 2,128.69
4. Step 4: Simplify right side
   2,653.81x = 7,769,888.80
5. Step 5: Solve for x
   x = 7,769,888.80/2,653.81
6. Step 6: Final answer
   x = 2,927.82