Finding the Fourth Proportional to 21,767.96, 32,630.34 and 12,989.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,767.96 : 32,630.34 = 12,989.72 : x
2. Step 2: Convert to fraction form
   21,767.96/32,630.34 = 12,989.72/x
3. Step 3: Cross multiply
   21,767.96x = 32,630.34 × 12,989.72
4. Step 4: Simplify right side
   21,767.96x = 423,858,980.10
5. Step 5: Solve for x
   x = 423,858,980.10/21,767.96
6. Step 6: Final answer
   x = 19,471.69