Finding the Fourth Proportional to 5,669.78, 8,447.69 and 5,351.47

Step by Step Solution

1. Step 1: Write the proportion equation
   5,669.78 : 8,447.69 = 5,351.47 : x
2. Step 2: Convert to fraction form
   5,669.78/8,447.69 = 5,351.47/x
3. Step 3: Cross multiply
   5,669.78x = 8,447.69 × 5,351.47
4. Step 4: Simplify right side
   5,669.78x = 45,207,559.60
5. Step 5: Solve for x
   x = 45,207,559.60/5,669.78
6. Step 6: Final answer
   x = 7,973.42