Finding the Fourth Proportional to 6,662.72, 9,978.53 and 5,266.68

Step by Step Solution

1. Step 1: Write the proportion equation
   6,662.72 : 9,978.53 = 5,266.68 : x
2. Step 2: Convert to fraction form
   6,662.72/9,978.53 = 5,266.68/x
3. Step 3: Cross multiply
   6,662.72x = 9,978.53 × 5,266.68
4. Step 4: Simplify right side
   6,662.72x = 52,553,698.05
5. Step 5: Solve for x
   x = 52,553,698.05/6,662.72
6. Step 6: Final answer
   x = 7,887.73