Finding the Fourth Proportional to 7,042.72, 9,718.60 and 3,898.84

Step by Step Solution

1. Step 1: Write the proportion equation
   7,042.72 : 9,718.60 = 3,898.84 : x
2. Step 2: Convert to fraction form
   7,042.72/9,718.60 = 3,898.84/x
3. Step 3: Cross multiply
   7,042.72x = 9,718.60 × 3,898.84
4. Step 4: Simplify right side
   7,042.72x = 37,891,266.42
5. Step 5: Solve for x
   x = 37,891,266.42/7,042.72
6. Step 6: Final answer
   x = 5,380.20