Finding the Fourth Proportional to 6,620.67, 9,915.89 and 3,160.35

Step by Step Solution

1. Step 1: Write the proportion equation
   6,620.67 : 9,915.89 = 3,160.35 : x
2. Step 2: Convert to fraction form
   6,620.67/9,915.89 = 3,160.35/x
3. Step 3: Cross multiply
   6,620.67x = 9,915.89 × 3,160.35
4. Step 4: Simplify right side
   6,620.67x = 31,337,667.16
5. Step 5: Solve for x
   x = 31,337,667.16/6,620.67
6. Step 6: Final answer
   x = 4,733.31