Finding the Fourth Proportional to 21,932.37, 30,251.07 and 12,980.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,932.37 : 30,251.07 = 12,980.25 : x
2. Step 2: Convert to fraction form
   21,932.37/30,251.07 = 12,980.25/x
3. Step 3: Cross multiply
   21,932.37x = 30,251.07 × 12,980.25
4. Step 4: Simplify right side
   21,932.37x = 392,666,451.37
5. Step 5: Solve for x
   x = 392,666,451.37/21,932.37
6. Step 6: Final answer
   x = 17,903.51