Finding the Fourth Proportional to 9,144.81, 12,619.98 and 5,112.11

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.81 : 12,619.98 = 5,112.11 : x
2. Step 2: Convert to fraction form
   9,144.81/12,619.98 = 5,112.11/x
3. Step 3: Cross multiply
   9,144.81x = 12,619.98 × 5,112.11
4. Step 4: Simplify right side
   9,144.81x = 64,514,662.86
5. Step 5: Solve for x
   x = 64,514,662.86/9,144.81
6. Step 6: Final answer
   x = 7,054.78