Finding the Fourth Proportional to 21,670.98, 29,905.56 and 12,111.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,670.98 : 29,905.56 = 12,111.05 : x
2. Step 2: Convert to fraction form
   21,670.98/29,905.56 = 12,111.05/x
3. Step 3: Cross multiply
   21,670.98x = 29,905.56 × 12,111.05
4. Step 4: Simplify right side
   21,670.98x = 362,187,582.91
5. Step 5: Solve for x
   x = 362,187,582.91/21,670.98
6. Step 6: Final answer
   x = 16,713.02