Finding the Fourth Proportional to 9,072.78, 12,514.42 and 5,485.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,072.78 : 12,514.42 = 5,485.40 : x
2. Step 2: Convert to fraction form
   9,072.78/12,514.42 = 5,485.40/x
3. Step 3: Cross multiply
   9,072.78x = 12,514.42 × 5,485.40
4. Step 4: Simplify right side
   9,072.78x = 68,646,599.47
5. Step 5: Solve for x
   x = 68,646,599.47/9,072.78
6. Step 6: Final answer
   x = 7,566.21