Finding the Fourth Proportional to 21,206.37, 31,814.73 and 14,978.55

Step by Step Solution

1. Step 1: Write the proportion equation
   21,206.37 : 31,814.73 = 14,978.55 : x
2. Step 2: Convert to fraction form
   21,206.37/31,814.73 = 14,978.55/x
3. Step 3: Cross multiply
   21,206.37x = 31,814.73 × 14,978.55
4. Step 4: Simplify right side
   21,206.37x = 476,538,524.04
5. Step 5: Solve for x
   x = 476,538,524.04/21,206.37
6. Step 6: Final answer
   x = 22,471.48