Finding the Fourth Proportional to 21,086.28, 29,101.96 and 12,133.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,086.28 : 29,101.96 = 12,133.60 : x
2. Step 2: Convert to fraction form
   21,086.28/29,101.96 = 12,133.60/x
3. Step 3: Cross multiply
   21,086.28x = 29,101.96 × 12,133.60
4. Step 4: Simplify right side
   21,086.28x = 353,111,541.86
5. Step 5: Solve for x
   x = 353,111,541.86/21,086.28
6. Step 6: Final answer
   x = 16,746.03