Finding the Fourth Proportional to 3,615.80, 5,430.98 and 3,513.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,615.80 : 5,430.98 = 3,513.72 : x
2. Step 2: Convert to fraction form
   3,615.80/5,430.98 = 3,513.72/x
3. Step 3: Cross multiply
   3,615.80x = 5,430.98 × 3,513.72
4. Step 4: Simplify right side
   3,615.80x = 19,082,943.05
5. Step 5: Solve for x
   x = 19,082,943.05/3,615.80
6. Step 6: Final answer
   x = 5,277.65