Finding the Fourth Proportional to 12,856.05, 17,739.47 and 7,552.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856.05 : 17,739.47 = 7,552.58 : x
2. Step 2: Convert to fraction form
   12,856.05/17,739.47 = 7,552.58/x
3. Step 3: Cross multiply
   12,856.05x = 17,739.47 × 7,552.58
4. Step 4: Simplify right side
   12,856.05x = 133,978,696.52
5. Step 5: Solve for x
   x = 133,978,696.52/12,856.05
6. Step 6: Final answer
   x = 10,421.45