Finding the Fourth Proportional to 21,086.84, 29,101.36 and 12,589.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,086.84 : 29,101.36 = 12,589.32 : x
2. Step 2: Convert to fraction form
   21,086.84/29,101.36 = 12,589.32/x
3. Step 3: Cross multiply
   21,086.84x = 29,101.36 × 12,589.32
4. Step 4: Simplify right side
   21,086.84x = 366,366,333.48
5. Step 5: Solve for x
   x = 366,366,333.48/21,086.84
6. Step 6: Final answer
   x = 17,374.17