Finding the Fourth Proportional to 10,661.79, 15,984.42 and 7,146.16

Step by Step Solution

1. Step 1: Write the proportion equation
   10,661.79 : 15,984.42 = 7,146.16 : x
2. Step 2: Convert to fraction form
   10,661.79/15,984.42 = 7,146.16/x
3. Step 3: Cross multiply
   10,661.79x = 15,984.42 × 7,146.16
4. Step 4: Simplify right side
   10,661.79x = 114,227,222.83
5. Step 5: Solve for x
   x = 114,227,222.83/10,661.79
6. Step 6: Final answer
   x = 10,713.71