Finding the Fourth Proportional to 12,722.39, 17,557.38 and 7,057.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,722.39 : 17,557.38 = 7,057.15 : x
2. Step 2: Convert to fraction form
   12,722.39/17,557.38 = 7,057.15/x
3. Step 3: Cross multiply
   12,722.39x = 17,557.38 × 7,057.15
4. Step 4: Simplify right side
   12,722.39x = 123,905,064.27
5. Step 5: Solve for x
   x = 123,905,064.27/12,722.39
6. Step 6: Final answer
   x = 9,739.13