Finding the Fourth Proportional to 7,185.39, 9,915.39 and 4,390.89

Step by Step Solution

1. Step 1: Write the proportion equation
   7,185.39 : 9,915.39 = 4,390.89 : x
2. Step 2: Convert to fraction form
   7,185.39/9,915.39 = 4,390.89/x
3. Step 3: Cross multiply
   7,185.39x = 9,915.39 × 4,390.89
4. Step 4: Simplify right side
   7,185.39x = 43,537,386.80
5. Step 5: Solve for x
   x = 43,537,386.80/7,185.39
6. Step 6: Final answer
   x = 6,059.15