Finding the Fourth Proportional to 9,871.05, 13,622.34 and 5,679.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,871.05 : 13,622.34 = 5,679.30 : x
2. Step 2: Convert to fraction form
   9,871.05/13,622.34 = 5,679.30/x
3. Step 3: Cross multiply
   9,871.05x = 13,622.34 × 5,679.30
4. Step 4: Simplify right side
   9,871.05x = 77,365,355.56
5. Step 5: Solve for x
   x = 77,365,355.56/9,871.05
6. Step 6: Final answer
   x = 7,837.60