Finding the Fourth Proportional to 9,412.05, 12,988.89 and 5,163.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,412.05 : 12,988.89 = 5,163.30 : x
2. Step 2: Convert to fraction form
   9,412.05/12,988.89 = 5,163.30/x
3. Step 3: Cross multiply
   9,412.05x = 12,988.89 × 5,163.30
4. Step 4: Simplify right side
   9,412.05x = 67,065,535.74
5. Step 5: Solve for x
   x = 67,065,535.74/9,412.05
6. Step 6: Final answer
   x = 7,125.50