Finding the Fourth Proportional to 9,318.72, 12,860.12 and 5,070.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,318.72 : 12,860.12 = 5,070.09 : x
2. Step 2: Convert to fraction form
   9,318.72/12,860.12 = 5,070.09/x
3. Step 3: Cross multiply
   9,318.72x = 12,860.12 × 5,070.09
4. Step 4: Simplify right side
   9,318.72x = 65,201,940.46
5. Step 5: Solve for x
   x = 65,201,940.46/9,318.72
6. Step 6: Final answer
   x = 6,996.88