Finding the Fourth Proportional to 21,488.13, 29,653.82 and 12,056.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,488.13 : 29,653.82 = 12,056.89 : x
2. Step 2: Convert to fraction form
   21,488.13/29,653.82 = 12,056.89/x
3. Step 3: Cross multiply
   21,488.13x = 29,653.82 × 12,056.89
4. Step 4: Simplify right side
   21,488.13x = 357,532,845.82
5. Step 5: Solve for x
   x = 357,532,845.82/21,488.13
6. Step 6: Final answer
   x = 16,638.62