Finding the Fourth Proportional to 6,404.72, 9,611.46 and 3,931.99

Step by Step Solution

1. Step 1: Write the proportion equation
   6,404.72 : 9,611.46 = 3,931.99 : x
2. Step 2: Convert to fraction form
   6,404.72/9,611.46 = 3,931.99/x
3. Step 3: Cross multiply
   6,404.72x = 9,611.46 × 3,931.99
4. Step 4: Simplify right side
   6,404.72x = 37,792,194.64
5. Step 5: Solve for x
   x = 37,792,194.64/6,404.72
6. Step 6: Final answer
   x = 5,900.68