Finding the Fourth Proportional to 12,648.78, 17,455.32 and 7,059.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,648.78 : 17,455.32 = 7,059.78 : x
2. Step 2: Convert to fraction form
   12,648.78/17,455.32 = 7,059.78/x
3. Step 3: Cross multiply
   12,648.78x = 17,455.32 × 7,059.78
4. Step 4: Simplify right side
   12,648.78x = 123,230,719.03
5. Step 5: Solve for x
   x = 123,230,719.03/12,648.78
6. Step 6: Final answer
   x = 9,742.50