Finding the Fourth Proportional to 6,400.59, 9,604.99 and 3,111.89

Step by Step Solution

1. Step 1: Write the proportion equation
   6,400.59 : 9,604.99 = 3,111.89 : x
2. Step 2: Convert to fraction form
   6,400.59/9,604.99 = 3,111.89/x
3. Step 3: Cross multiply
   6,400.59x = 9,604.99 × 3,111.89
4. Step 4: Simplify right side
   6,400.59x = 29,889,672.33
5. Step 5: Solve for x
   x = 29,889,672.33/6,400.59
6. Step 6: Final answer
   x = 4,669.83