Finding the Fourth Proportional to 9,343.61, 12,894.81 and 5,711.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,343.61 : 12,894.81 = 5,711.21 : x
2. Step 2: Convert to fraction form
   9,343.61/12,894.81 = 5,711.21/x
3. Step 3: Cross multiply
   9,343.61x = 12,894.81 × 5,711.21
4. Step 4: Simplify right side
   9,343.61x = 73,644,967.82
5. Step 5: Solve for x
   x = 73,644,967.82/9,343.61
6. Step 6: Final answer
   x = 7,881.86