Finding the Fourth Proportional to 21,896.01, 30,216.53 and 12,947.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,896.01 : 30,216.53 = 12,947.94 : x
2. Step 2: Convert to fraction form
   21,896.01/30,216.53 = 12,947.94/x
3. Step 3: Cross multiply
   21,896.01x = 30,216.53 × 12,947.94
4. Step 4: Simplify right side
   21,896.01x = 391,241,752.71
5. Step 5: Solve for x
   x = 391,241,752.71/21,896.01
6. Step 6: Final answer
   x = 17,868.18