Finding the Fourth Proportional to 21,671.46, 29,906.35 and 12,111.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,671.46 : 29,906.35 = 12,111.50 : x
2. Step 2: Convert to fraction form
   21,671.46/29,906.35 = 12,111.50/x
3. Step 3: Cross multiply
   21,671.46x = 29,906.35 × 12,111.50
4. Step 4: Simplify right side
   21,671.46x = 362,210,802.51
5. Step 5: Solve for x
   x = 362,210,802.51/21,671.46
6. Step 6: Final answer
   x = 16,713.72