Finding the Fourth Proportional to 21,046.89, 29,043.50 and 12,558.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,046.89 : 29,043.50 = 12,558.63 : x
2. Step 2: Convert to fraction form
   21,046.89/29,043.50 = 12,558.63/x
3. Step 3: Cross multiply
   21,046.89x = 29,043.50 × 12,558.63
4. Step 4: Simplify right side
   21,046.89x = 364,746,507.61
5. Step 5: Solve for x
   x = 364,746,507.61/21,046.89
6. Step 6: Final answer
   x = 17,330.19