Finding the Fourth Proportional to 9,411.07, 12,987.84 and 5,379.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,411.07 : 12,987.84 = 5,379.16 : x
2. Step 2: Convert to fraction form
   9,411.07/12,987.84 = 5,379.16/x
3. Step 3: Cross multiply
   9,411.07x = 12,987.84 × 5,379.16
4. Step 4: Simplify right side
   9,411.07x = 69,863,669.41
5. Step 5: Solve for x
   x = 69,863,669.41/9,411.07
6. Step 6: Final answer
   x = 7,423.56