Finding the Fourth Proportional to 6,501.78, 9,756.18 and 4,311.54

Step by Step Solution

1. Step 1: Write the proportion equation
   6,501.78 : 9,756.18 = 4,311.54 : x
2. Step 2: Convert to fraction form
   6,501.78/9,756.18 = 4,311.54/x
3. Step 3: Cross multiply
   6,501.78x = 9,756.18 × 4,311.54
4. Step 4: Simplify right side
   6,501.78x = 42,064,160.32
5. Step 5: Solve for x
   x = 42,064,160.32/6,501.78
6. Step 6: Final answer
   x = 6,469.64