Finding the Fourth Proportional to 21,154.80, 29,200.06 and 12,208.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,154.80 : 29,200.06 = 12,208.15 : x
2. Step 2: Convert to fraction form
   21,154.80/29,200.06 = 12,208.15/x
3. Step 3: Cross multiply
   21,154.80x = 29,200.06 × 12,208.15
4. Step 4: Simplify right side
   21,154.80x = 356,478,764.25
5. Step 5: Solve for x
   x = 356,478,764.25/21,154.80
6. Step 6: Final answer
   x = 16,850.96