Finding the Fourth Proportional to 19,087.46, 28,639.72 and 7,401.60

Step by Step Solution

1. Step 1: Write the proportion equation
   19,087.46 : 28,639.72 = 7,401.60 : x
2. Step 2: Convert to fraction form
   19,087.46/28,639.72 = 7,401.60/x
3. Step 3: Cross multiply
   19,087.46x = 28,639.72 × 7,401.60
4. Step 4: Simplify right side
   19,087.46x = 211,979,751.55
5. Step 5: Solve for x
   x = 211,979,751.55/19,087.46
6. Step 6: Final answer
   x = 11,105.71