Finding the Fourth Proportional to 6,488.45, 9,735.56 and 3,155.21

Step by Step Solution

1. Step 1: Write the proportion equation
   6,488.45 : 9,735.56 = 3,155.21 : x
2. Step 2: Convert to fraction form
   6,488.45/9,735.56 = 3,155.21/x
3. Step 3: Cross multiply
   6,488.45x = 9,735.56 × 3,155.21
4. Step 4: Simplify right side
   6,488.45x = 30,717,671.81
5. Step 5: Solve for x
   x = 30,717,671.81/6,488.45
6. Step 6: Final answer
   x = 4,734.21