Finding the Fourth Proportional to 21,978.96, 32,961.96 and 12,617.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.96 : 32,961.96 = 12,617.34 : x
2. Step 2: Convert to fraction form
   21,978.96/32,961.96 = 12,617.34/x
3. Step 3: Cross multiply
   21,978.96x = 32,961.96 × 12,617.34
4. Step 4: Simplify right side
   21,978.96x = 415,892,256.39
5. Step 5: Solve for x
   x = 415,892,256.39/21,978.96
6. Step 6: Final answer
   x = 18,922.29