Finding the Fourth Proportional to 9,315.32, 12,855.20 and 5,066.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.32 : 12,855.20 = 5,066.42 : x
2. Step 2: Convert to fraction form
   9,315.32/12,855.20 = 5,066.42/x
3. Step 3: Cross multiply
   9,315.32x = 12,855.20 × 5,066.42
4. Step 4: Simplify right side
   9,315.32x = 65,129,842.38
5. Step 5: Solve for x
   x = 65,129,842.38/9,315.32
6. Step 6: Final answer
   x = 6,991.69