Finding the Fourth Proportional to 12,678.56, 17,495.99 and 7,013.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,678.56 : 17,495.99 = 7,013.22 : x
2. Step 2: Convert to fraction form
   12,678.56/17,495.99 = 7,013.22/x
3. Step 3: Cross multiply
   12,678.56x = 17,495.99 × 7,013.22
4. Step 4: Simplify right side
   12,678.56x = 122,703,191.92
5. Step 5: Solve for x
   x = 122,703,191.92/12,678.56
6. Step 6: Final answer
   x = 9,678.01