Finding the Fourth Proportional to 9,411.31, 12,987.62 and 5,219.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,411.31 : 12,987.62 = 5,219.59 : x
2. Step 2: Convert to fraction form
   9,411.31/12,987.62 = 5,219.59/x
3. Step 3: Cross multiply
   9,411.31x = 12,987.62 × 5,219.59
4. Step 4: Simplify right side
   9,411.31x = 67,790,051.48
5. Step 5: Solve for x
   x = 67,790,051.48/9,411.31
6. Step 6: Final answer
   x = 7,203.04