Finding the Fourth Proportional to 5,274.69, 7,911.88 and 2,153.89

Step by Step Solution

1. Step 1: Write the proportion equation
   5,274.69 : 7,911.88 = 2,153.89 : x
2. Step 2: Convert to fraction form
   5,274.69/7,911.88 = 2,153.89/x
3. Step 3: Cross multiply
   5,274.69x = 7,911.88 × 2,153.89
4. Step 4: Simplify right side
   5,274.69x = 17,041,323.72
5. Step 5: Solve for x
   x = 17,041,323.72/5,274.69
6. Step 6: Final answer
   x = 3,230.77