Finding the Fourth Proportional to 13,708.56, 18,917.82 and 7,420.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,708.56 : 18,917.82 = 7,420.94 : x
2. Step 2: Convert to fraction form
   13,708.56/18,917.82 = 7,420.94/x
3. Step 3: Cross multiply
   13,708.56x = 18,917.82 × 7,420.94
4. Step 4: Simplify right side
   13,708.56x = 140,387,912.56
5. Step 5: Solve for x
   x = 140,387,912.56/13,708.56
6. Step 6: Final answer
   x = 10,240.89