Finding the Fourth Proportional to 21,278.76, 29,364.55 and 12,326.07

Step by Step Solution

1. Step 1: Write the proportion equation
   21,278.76 : 29,364.55 = 12,326.07 : x
2. Step 2: Convert to fraction form
   21,278.76/29,364.55 = 12,326.07/x
3. Step 3: Cross multiply
   21,278.76x = 29,364.55 × 12,326.07
4. Step 4: Simplify right side
   21,278.76x = 361,949,498.82
5. Step 5: Solve for x
   x = 361,949,498.82/21,278.76
6. Step 6: Final answer
   x = 17,009.90