Finding the Fourth Proportional to 21,707.54, 29,956.96 and 12,147.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,707.54 : 29,956.96 = 12,147.10 : x
2. Step 2: Convert to fraction form
   21,707.54/29,956.96 = 12,147.10/x
3. Step 3: Cross multiply
   21,707.54x = 29,956.96 × 12,147.10
4. Step 4: Simplify right side
   21,707.54x = 363,890,188.82
5. Step 5: Solve for x
   x = 363,890,188.82/21,707.54
6. Step 6: Final answer
   x = 16,763.31