Finding the Fourth Proportional to 9,315.31, 12,855.30 and 5,066.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.31 : 12,855.30 = 5,066.47 : x
2. Step 2: Convert to fraction form
   9,315.31/12,855.30 = 5,066.47/x
3. Step 3: Cross multiply
   9,315.31x = 12,855.30 × 5,066.47
4. Step 4: Simplify right side
   9,315.31x = 65,130,952.57
5. Step 5: Solve for x
   x = 65,130,952.57/9,315.31
6. Step 6: Final answer
   x = 6,991.82