Finding the Fourth Proportional to 21,509.10, 29,677.71 and 12,077.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,509.10 : 29,677.71 = 12,077.04 : x
2. Step 2: Convert to fraction form
   21,509.10/29,677.71 = 12,077.04/x
3. Step 3: Cross multiply
   21,509.10x = 29,677.71 × 12,077.04
4. Step 4: Simplify right side
   21,509.10x = 358,418,890.78
5. Step 5: Solve for x
   x = 358,418,890.78/21,509.10
6. Step 6: Final answer
   x = 16,663.59