Finding the Fourth Proportional to 12,678.59, 17,495.90 and 7,013.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,678.59 : 17,495.90 = 7,013.55 : x
2. Step 2: Convert to fraction form
   12,678.59/17,495.90 = 7,013.55/x
3. Step 3: Cross multiply
   12,678.59x = 17,495.90 × 7,013.55
4. Step 4: Simplify right side
   12,678.59x = 122,708,426.29
5. Step 5: Solve for x
   x = 122,708,426.29/12,678.59
6. Step 6: Final answer
   x = 9,678.40