Finding the Fourth Proportional to 21,980.56, 30,331.56 and 12,417.46

Step by Step Solution

1. Step 1: Write the proportion equation
   21,980.56 : 30,331.56 = 12,417.46 : x
2. Step 2: Convert to fraction form
   21,980.56/30,331.56 = 12,417.46/x
3. Step 3: Cross multiply
   21,980.56x = 30,331.56 × 12,417.46
4. Step 4: Simplify right side
   21,980.56x = 376,640,933.04
5. Step 5: Solve for x
   x = 376,640,933.04/21,980.56
6. Step 6: Final answer
   x = 17,135.18