Finding the Fourth Proportional to 9,411.04, 12,986.88 and 5,219.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,411.04 : 12,986.88 = 5,219.20 : x
2. Step 2: Convert to fraction form
   9,411.04/12,986.88 = 5,219.20/x
3. Step 3: Cross multiply
   9,411.04x = 12,986.88 × 5,219.20
4. Step 4: Simplify right side
   9,411.04x = 67,781,124.10
5. Step 5: Solve for x
   x = 67,781,124.10/9,411.04
6. Step 6: Final answer
   x = 7,202.30