Finding the Fourth Proportional to 9,306.47, 12,842.89 and 5,057.51

Step by Step Solution

1. Step 1: Write the proportion equation
   9,306.47 : 12,842.89 = 5,057.51 : x
2. Step 2: Convert to fraction form
   9,306.47/12,842.89 = 5,057.51/x
3. Step 3: Cross multiply
   9,306.47x = 12,842.89 × 5,057.51
4. Step 4: Simplify right side
   9,306.47x = 64,952,967.75
5. Step 5: Solve for x
   x = 64,952,967.75/9,306.47
6. Step 6: Final answer
   x = 6,979.33