Finding the Fourth Proportional to 4,736.88, 7,112.61 and 4,221.72

Step by Step Solution

1. Step 1: Write the proportion equation
   4,736.88 : 7,112.61 = 4,221.72 : x
2. Step 2: Convert to fraction form
   4,736.88/7,112.61 = 4,221.72/x
3. Step 3: Cross multiply
   4,736.88x = 7,112.61 × 4,221.72
4. Step 4: Simplify right side
   4,736.88x = 30,027,447.89
5. Step 5: Solve for x
   x = 30,027,447.89/4,736.88
6. Step 6: Final answer
   x = 6,339.08