Finding the Fourth Proportional to 9,315.78, 12,858.52 and 5,541.62

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.78 : 12,858.52 = 5,541.62 : x
2. Step 2: Convert to fraction form
   9,315.78/12,858.52 = 5,541.62/x
3. Step 3: Cross multiply
   9,315.78x = 12,858.52 × 5,541.62
4. Step 4: Simplify right side
   9,315.78x = 71,257,031.60
5. Step 5: Solve for x
   x = 71,257,031.60/9,315.78
6. Step 6: Final answer
   x = 7,649.07