Finding the Fourth Proportional to 4,386.43, 6,580.72 and 3,090.43

Step by Step Solution

1. Step 1: Write the proportion equation
   4,386.43 : 6,580.72 = 3,090.43 : x
2. Step 2: Convert to fraction form
   4,386.43/6,580.72 = 3,090.43/x
3. Step 3: Cross multiply
   4,386.43x = 6,580.72 × 3,090.43
4. Step 4: Simplify right side
   4,386.43x = 20,337,221.61
5. Step 5: Solve for x
   x = 20,337,221.61/4,386.43
6. Step 6: Final answer
   x = 4,636.40