Finding the Fourth Proportional to 9,315.69, 12,854.87 and 5,486.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.69 : 12,854.87 = 5,486.72 : x
2. Step 2: Convert to fraction form
   9,315.69/12,854.87 = 5,486.72/x
3. Step 3: Cross multiply
   9,315.69x = 12,854.87 × 5,486.72
4. Step 4: Simplify right side
   9,315.69x = 70,531,001.19
5. Step 5: Solve for x
   x = 70,531,001.19/9,315.69
6. Step 6: Final answer
   x = 7,571.21