Finding the Fourth Proportional to 21,178.68, 31,764.18 and 8,026.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,178.68 : 31,764.18 = 8,026.72 : x
2. Step 2: Convert to fraction form
   21,178.68/31,764.18 = 8,026.72/x
3. Step 3: Cross multiply
   21,178.68x = 31,764.18 × 8,026.72
4. Step 4: Simplify right side
   21,178.68x = 254,962,178.89
5. Step 5: Solve for x
   x = 254,962,178.89/21,178.68
6. Step 6: Final answer
   x = 12,038.62