Finding the Fourth Proportional to 10,561.91, 15,836.49 and 7,271.42

Step by Step Solution

1. Step 1: Write the proportion equation
   10,561.91 : 15,836.49 = 7,271.42 : x
2. Step 2: Convert to fraction form
   10,561.91/15,836.49 = 7,271.42/x
3. Step 3: Cross multiply
   10,561.91x = 15,836.49 × 7,271.42
4. Step 4: Simplify right side
   10,561.91x = 115,153,690.93
5. Step 5: Solve for x
   x = 115,153,690.93/10,561.91
6. Step 6: Final answer
   x = 10,902.74