Finding the Fourth Proportional to 21,472.84, 29,634.15 and 12,520.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,472.84 : 29,634.15 = 12,520.72 : x
2. Step 2: Convert to fraction form
   21,472.84/29,634.15 = 12,520.72/x
3. Step 3: Cross multiply
   21,472.84x = 29,634.15 × 12,520.72
4. Step 4: Simplify right side
   21,472.84x = 371,040,894.59
5. Step 5: Solve for x
   x = 371,040,894.59/21,472.84
6. Step 6: Final answer
   x = 17,279.54