Finding the Fourth Proportional to 9,411.72, 12,987.74 and 5,219.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,411.72 : 12,987.74 = 5,219.88 : x
2. Step 2: Convert to fraction form
   9,411.72/12,987.74 = 5,219.88/x
3. Step 3: Cross multiply
   9,411.72x = 12,987.74 × 5,219.88
4. Step 4: Simplify right side
   9,411.72x = 67,794,444.27
5. Step 5: Solve for x
   x = 67,794,444.27/9,411.72
6. Step 6: Final answer
   x = 7,203.19