Finding the Fourth Proportional to 21,060.05, 29,062.69 and 11,499.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,060.05 : 29,062.69 = 11,499.89 : x
2. Step 2: Convert to fraction form
   21,060.05/29,062.69 = 11,499.89/x
3. Step 3: Cross multiply
   21,060.05x = 29,062.69 × 11,499.89
4. Step 4: Simplify right side
   21,060.05x = 334,217,782.01
5. Step 5: Solve for x
   x = 334,217,782.01/21,060.05
6. Step 6: Final answer
   x = 15,869.75