Finding the Fourth Proportional to 3,986,358.55, 5,980,488.18 and 1,290,684.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986,358.55 : 5,980,488.18 = 1,290,684.57 : x
2. Step 2: Convert to fraction form
   3,986,358.55/5,980,488.18 = 1,290,684.57/x
3. Step 3: Cross multiply
   3,986,358.55x = 5,980,488.18 × 1,290,684.57
4. Step 4: Simplify right side
   3,986,358.55x = 7,718,923,814,993.38
5. Step 5: Solve for x
   x = 7,718,923,814,993.38/3,986,358.55
6. Step 6: Final answer
   x = 1,936,334.56