Finding the Fourth Proportional to 21,068.19, 29,079.69 and 13,105.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,068.19 : 29,079.69 = 13,105.89 : x
2. Step 2: Convert to fraction form
   21,068.19/29,079.69 = 13,105.89/x
3. Step 3: Cross multiply
   21,068.19x = 29,079.69 × 13,105.89
4. Step 4: Simplify right side
   21,068.19x = 381,115,152.84
5. Step 5: Solve for x
   x = 381,115,152.84/21,068.19
6. Step 6: Final answer
   x = 18,089.60