Finding the Fourth Proportional to 9,145.04, 12,619.72 and 5,112.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.04 : 12,619.72 = 5,112.05 : x
2. Step 2: Convert to fraction form
   9,145.04/12,619.72 = 5,112.05/x
3. Step 3: Cross multiply
   9,145.04x = 12,619.72 × 5,112.05
4. Step 4: Simplify right side
   9,145.04x = 64,512,658.40
5. Step 5: Solve for x
   x = 64,512,658.40/9,145.04
6. Step 6: Final answer
   x = 7,054.39