Finding the Fourth Proportional to 9,415.09, 12,987.42 and 5,872.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,415.09 : 12,987.42 = 5,872.15 : x
2. Step 2: Convert to fraction form
   9,415.09/12,987.42 = 5,872.15/x
3. Step 3: Cross multiply
   9,415.09x = 12,987.42 × 5,872.15
4. Step 4: Simplify right side
   9,415.09x = 76,264,078.35
5. Step 5: Solve for x
   x = 76,264,078.35/9,415.09
6. Step 6: Final answer
   x = 8,100.20