Finding the Fourth Proportional to 21,060.96, 29,064.12 and 12,111.35

Step by Step Solution

1. Step 1: Write the proportion equation
   21,060.96 : 29,064.12 = 12,111.35 : x
2. Step 2: Convert to fraction form
   21,060.96/29,064.12 = 12,111.35/x
3. Step 3: Cross multiply
   21,060.96x = 29,064.12 × 12,111.35
4. Step 4: Simplify right side
   21,060.96x = 352,005,620.77
5. Step 5: Solve for x
   x = 352,005,620.77/21,060.96
6. Step 6: Final answer
   x = 16,713.65