Finding the Fourth Proportional to 21,505.50, 29,680.02 and 12,077.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,505.50 : 29,680.02 = 12,077.10 : x
2. Step 2: Convert to fraction form
   21,505.50/29,680.02 = 12,077.10/x
3. Step 3: Cross multiply
   21,505.50x = 29,680.02 × 12,077.10
4. Step 4: Simplify right side
   21,505.50x = 358,448,569.54
5. Step 5: Solve for x
   x = 358,448,569.54/21,505.50
6. Step 6: Final answer
   x = 16,667.76