Finding the Fourth Proportional to 21,127.94, 31,692.82 and 7,981.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,127.94 : 31,692.82 = 7,981.34 : x
2. Step 2: Convert to fraction form
   21,127.94/31,692.82 = 7,981.34/x
3. Step 3: Cross multiply
   21,127.94x = 31,692.82 × 7,981.34
4. Step 4: Simplify right side
   21,127.94x = 252,951,008.53
5. Step 5: Solve for x
   x = 252,951,008.53/21,127.94
6. Step 6: Final answer
   x = 11,972.35