Finding the Fourth Proportional to 23,105.37, 31,830.12 and 21,979.77

Step by Step Solution

1. Step 1: Write the proportion equation
   23,105.37 : 31,830.12 = 21,979.77 : x
2. Step 2: Convert to fraction form
   23,105.37/31,830.12 = 21,979.77/x
3. Step 3: Cross multiply
   23,105.37x = 31,830.12 × 21,979.77
4. Step 4: Simplify right side
   23,105.37x = 699,618,716.67
5. Step 5: Solve for x
   x = 699,618,716.67/23,105.37
6. Step 6: Final answer
   x = 30,279.49