Finding the Fourth Proportional to 21,019.25, 29,006.76 and 11,588.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,019.25 : 29,006.76 = 11,588.15 : x
2. Step 2: Convert to fraction form
   21,019.25/29,006.76 = 11,588.15/x
3. Step 3: Cross multiply
   21,019.25x = 29,006.76 × 11,588.15
4. Step 4: Simplify right side
   21,019.25x = 336,134,540.86
5. Step 5: Solve for x
   x = 336,134,540.86/21,019.25
6. Step 6: Final answer
   x = 15,991.75