Finding the Fourth Proportional to 7,091.72, 9,788.72 and 4,108.28

Step by Step Solution

1. Step 1: Write the proportion equation
   7,091.72 : 9,788.72 = 4,108.28 : x
2. Step 2: Convert to fraction form
   7,091.72/9,788.72 = 4,108.28/x
3. Step 3: Cross multiply
   7,091.72x = 9,788.72 × 4,108.28
4. Step 4: Simplify right side
   7,091.72x = 40,214,802.60
5. Step 5: Solve for x
   x = 40,214,802.60/7,091.72
6. Step 6: Final answer
   x = 5,670.67