Finding the Fourth Proportional to 3,625.36, 5,430.72 and 2,389.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,625.36 : 5,430.72 = 2,389.72 : x
2. Step 2: Convert to fraction form
   3,625.36/5,430.72 = 2,389.72/x
3. Step 3: Cross multiply
   3,625.36x = 5,430.72 × 2,389.72
4. Step 4: Simplify right side
   3,625.36x = 12,977,900.20
5. Step 5: Solve for x
   x = 12,977,900.20/3,625.36
6. Step 6: Final answer
   x = 3,579.75