Finding the Fourth Proportional to 9,119.07, 12,587.67 and 7,143.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,119.07 : 12,587.67 = 7,143.48 : x
2. Step 2: Convert to fraction form
   9,119.07/12,587.67 = 7,143.48/x
3. Step 3: Cross multiply
   9,119.07x = 12,587.67 × 7,143.48
4. Step 4: Simplify right side
   9,119.07x = 89,919,768.89
5. Step 5: Solve for x
   x = 89,919,768.89/9,119.07
6. Step 6: Final answer
   x = 9,860.63