Finding the Fourth Proportional to 3,913.55, 5,870.78 and 3,090.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,913.55 : 5,870.78 = 3,090.69 : x
2. Step 2: Convert to fraction form
   3,913.55/5,870.78 = 3,090.69/x
3. Step 3: Cross multiply
   3,913.55x = 5,870.78 × 3,090.69
4. Step 4: Simplify right side
   3,913.55x = 18,144,757.17
5. Step 5: Solve for x
   x = 18,144,757.17/3,913.55
6. Step 6: Final answer
   x = 4,636.39