Finding the Fourth Proportional to 10,989.56, 16,570.54 and 10,071.02

Step by Step Solution

1. Step 1: Write the proportion equation
   10,989.56 : 16,570.54 = 10,071.02 : x
2. Step 2: Convert to fraction form
   10,989.56/16,570.54 = 10,071.02/x
3. Step 3: Cross multiply
   10,989.56x = 16,570.54 × 10,071.02
4. Step 4: Simplify right side
   10,989.56x = 166,882,239.75
5. Step 5: Solve for x
   x = 166,882,239.75/10,989.56
6. Step 6: Final answer
   x = 15,185.53