Finding the Fourth Proportional to 7,085.12, 9,777.36 and 4,100.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,085.12 : 9,777.36 = 4,100.72 : x
2. Step 2: Convert to fraction form
   7,085.12/9,777.36 = 4,100.72/x
3. Step 3: Cross multiply
   7,085.12x = 9,777.36 × 4,100.72
4. Step 4: Simplify right side
   7,085.12x = 40,094,215.70
5. Step 5: Solve for x
   x = 40,094,215.70/7,085.12
6. Step 6: Final answer
   x = 5,658.93