Finding the Fourth Proportional to 9,335.16, 12,878.18 and 5,556.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,335.16 : 12,878.18 = 5,556.21 : x
2. Step 2: Convert to fraction form
   9,335.16/12,878.18 = 5,556.21/x
3. Step 3: Cross multiply
   9,335.16x = 12,878.18 × 5,556.21
4. Step 4: Simplify right side
   9,335.16x = 71,553,872.50
5. Step 5: Solve for x
   x = 71,553,872.50/9,335.16
6. Step 6: Final answer
   x = 7,664.99