Finding the Fourth Proportional to 9,353.90, 12,907.21 and 5,721.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,353.90 : 12,907.21 = 5,721.76 : x
2. Step 2: Convert to fraction form
   9,353.90/12,907.21 = 5,721.76/x
3. Step 3: Cross multiply
   9,353.90x = 12,907.21 × 5,721.76
4. Step 4: Simplify right side
   9,353.90x = 73,851,957.89
5. Step 5: Solve for x
   x = 73,851,957.89/9,353.90
6. Step 6: Final answer
   x = 7,895.31