Finding the Fourth Proportional to 21,947.02, 30,287.28 and 12,388.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,947.02 : 30,287.28 = 12,388.82 : x
2. Step 2: Convert to fraction form
   21,947.02/30,287.28 = 12,388.82/x
3. Step 3: Cross multiply
   21,947.02x = 30,287.28 × 12,388.82
4. Step 4: Simplify right side
   21,947.02x = 375,223,622.35
5. Step 5: Solve for x
   x = 375,223,622.35/21,947.02
6. Step 6: Final answer
   x = 17,096.79