Finding the Fourth Proportional to 21,499.91, 29,669.87 and 12,071.51

Step by Step Solution

1. Step 1: Write the proportion equation
   21,499.91 : 29,669.87 = 12,071.51 : x
2. Step 2: Convert to fraction form
   21,499.91/29,669.87 = 12,071.51/x
3. Step 3: Cross multiply
   21,499.91x = 29,669.87 × 12,071.51
4. Step 4: Simplify right side
   21,499.91x = 358,160,132.40
5. Step 5: Solve for x
   x = 358,160,132.40/21,499.91
6. Step 6: Final answer
   x = 16,658.68