Finding the Fourth Proportional to 9,315.50, 12,855.42 and 5,124.02

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.50 : 12,855.42 = 5,124.02 : x
2. Step 2: Convert to fraction form
   9,315.50/12,855.42 = 5,124.02/x
3. Step 3: Cross multiply
   9,315.50x = 12,855.42 × 5,124.02
4. Step 4: Simplify right side
   9,315.50x = 65,871,429.19
5. Step 5: Solve for x
   x = 65,871,429.19/9,315.50
6. Step 6: Final answer
   x = 7,071.16