Finding the Fourth Proportional to 9,401.47, 12,968.61 and 7,815.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,401.47 : 12,968.61 = 7,815.89 : x
2. Step 2: Convert to fraction form
   9,401.47/12,968.61 = 7,815.89/x
3. Step 3: Cross multiply
   9,401.47x = 12,968.61 × 7,815.89
4. Step 4: Simplify right side
   9,401.47x = 101,361,232.32
5. Step 5: Solve for x
   x = 101,361,232.32/9,401.47
6. Step 6: Final answer
   x = 10,781.43