Finding the Fourth Proportional to 8,081.78, 12,135.41 and 4,809.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,081.78 : 12,135.41 = 4,809.47 : x
2. Step 2: Convert to fraction form
   8,081.78/12,135.41 = 4,809.47/x
3. Step 3: Cross multiply
   8,081.78x = 12,135.41 × 4,809.47
4. Step 4: Simplify right side
   8,081.78x = 58,364,932.69
5. Step 5: Solve for x
   x = 58,364,932.69/8,081.78
6. Step 6: Final answer
   x = 7,221.80