Finding the Fourth Proportional to 10,990.56, 16,572.05 and 10,072.02

Step by Step Solution

1. Step 1: Write the proportion equation
   10,990.56 : 16,572.05 = 10,072.02 : x
2. Step 2: Convert to fraction form
   10,990.56/16,572.05 = 10,072.02/x
3. Step 3: Cross multiply
   10,990.56x = 16,572.05 × 10,072.02
4. Step 4: Simplify right side
   10,990.56x = 166,914,019.04
5. Step 5: Solve for x
   x = 166,914,019.04/10,990.56
6. Step 6: Final answer
   x = 15,187.03