Finding the Fourth Proportional to 21,908.91, 30,235.88 and 12,477.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,908.91 : 30,235.88 = 12,477.48 : x
2. Step 2: Convert to fraction form
   21,908.91/30,235.88 = 12,477.48/x
3. Step 3: Cross multiply
   21,908.91x = 30,235.88 × 12,477.48
4. Step 4: Simplify right side
   21,908.91x = 377,267,505.79
5. Step 5: Solve for x
   x = 377,267,505.79/21,908.91
6. Step 6: Final answer
   x = 17,219.82