Finding the Fourth Proportional to 21,633.01, 29,856.54 and 12,682.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,633.01 : 29,856.54 = 12,682.72 : x
2. Step 2: Convert to fraction form
   21,633.01/29,856.54 = 12,682.72/x
3. Step 3: Cross multiply
   21,633.01x = 29,856.54 × 12,682.72
4. Step 4: Simplify right side
   21,633.01x = 378,662,136.99
5. Step 5: Solve for x
   x = 378,662,136.99/21,633.01
6. Step 6: Final answer
   x = 17,503.90