Finding the Fourth Proportional to 21,152.16, 29,191.86 and 12,078.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,152.16 : 29,191.86 = 12,078.54 : x
2. Step 2: Convert to fraction form
   21,152.16/29,191.86 = 12,078.54/x
3. Step 3: Cross multiply
   21,152.16x = 29,191.86 × 12,078.54
4. Step 4: Simplify right side
   21,152.16x = 352,595,048.68
5. Step 5: Solve for x
   x = 352,595,048.68/21,152.16
6. Step 6: Final answer
   x = 16,669.46