Finding the Fourth Proportional to 3,615.90, 5,420.17 and 1,426.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,615.90 : 5,420.17 = 1,426.15 : x
2. Step 2: Convert to fraction form
   3,615.90/5,420.17 = 1,426.15/x
3. Step 3: Cross multiply
   3,615.90x = 5,420.17 × 1,426.15
4. Step 4: Simplify right side
   3,615.90x = 7,729,975.45
5. Step 5: Solve for x
   x = 7,729,975.45/3,615.90
6. Step 6: Final answer
   x = 2,137.77