Finding the Fourth Proportional to 21,325.68, 31,978.80 and 10,944.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,325.68 : 31,978.80 = 10,944.72 : x
2. Step 2: Convert to fraction form
   21,325.68/31,978.80 = 10,944.72/x
3. Step 3: Cross multiply
   21,325.68x = 31,978.80 × 10,944.72
4. Step 4: Simplify right side
   21,325.68x = 349,999,011.94
5. Step 5: Solve for x
   x = 349,999,011.94/21,325.68
6. Step 6: Final answer
   x = 16,412.09