Finding the Fourth Proportional to 9,290.48, 12,821.68 and 5,099.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,290.48 : 12,821.68 = 5,099.60 : x
2. Step 2: Convert to fraction form
   9,290.48/12,821.68 = 5,099.60/x
3. Step 3: Cross multiply
   9,290.48x = 12,821.68 × 5,099.60
4. Step 4: Simplify right side
   9,290.48x = 65,385,439.33
5. Step 5: Solve for x
   x = 65,385,439.33/9,290.48
6. Step 6: Final answer
   x = 7,037.90