Finding the Fourth Proportional to 21,963.76, 30,308.76 and 13,012.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,963.76 : 30,308.76 = 13,012.12 : x
2. Step 2: Convert to fraction form
   21,963.76/30,308.76 = 13,012.12/x
3. Step 3: Cross multiply
   21,963.76x = 30,308.76 × 13,012.12
4. Step 4: Simplify right side
   21,963.76x = 394,381,222.17
5. Step 5: Solve for x
   x = 394,381,222.17/21,963.76
6. Step 6: Final answer
   x = 17,956.00