Finding the Fourth Proportional to 21,340.17, 29,454.72 and 12,963.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,340.17 : 29,454.72 = 12,963.69 : x
2. Step 2: Convert to fraction form
   21,340.17/29,454.72 = 12,963.69/x
3. Step 3: Cross multiply
   21,340.17x = 29,454.72 × 12,963.69
4. Step 4: Simplify right side
   21,340.17x = 381,841,859.12
5. Step 5: Solve for x
   x = 381,841,859.12/21,340.17
6. Step 6: Final answer
   x = 17,893.10