Finding the Fourth Proportional to 21,072.77, 29,080.99 and 12,579.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,072.77 : 29,080.99 = 12,579.82 : x
2. Step 2: Convert to fraction form
   21,072.77/29,080.99 = 12,579.82/x
3. Step 3: Cross multiply
   21,072.77x = 29,080.99 × 12,579.82
4. Step 4: Simplify right side
   21,072.77x = 365,833,411.32
5. Step 5: Solve for x
   x = 365,833,411.32/21,072.77
6. Step 6: Final answer
   x = 17,360.48