Finding the Fourth Proportional to 21,734.96, 32,580.84 and 12,956.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,734.96 : 32,580.84 = 12,956.72 : x
2. Step 2: Convert to fraction form
   21,734.96/32,580.84 = 12,956.72/x
3. Step 3: Cross multiply
   21,734.96x = 32,580.84 × 12,956.72
4. Step 4: Simplify right side
   21,734.96x = 422,140,821.24
5. Step 5: Solve for x
   x = 422,140,821.24/21,734.96
6. Step 6: Final answer
   x = 19,422.20