Finding the Fourth Proportional to 12,974.56, 19,459.88 and 3,613.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,974.56 : 19,459.88 = 3,613.60 : x
2. Step 2: Convert to fraction form
   12,974.56/19,459.88 = 3,613.60/x
3. Step 3: Cross multiply
   12,974.56x = 19,459.88 × 3,613.60
4. Step 4: Simplify right side
   12,974.56x = 70,320,222.37
5. Step 5: Solve for x
   x = 70,320,222.37/12,974.56
6. Step 6: Final answer
   x = 5,419.85