Finding the Fourth Proportional to 13,388.15, 18,475.81 and 7,419.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,388.15 : 18,475.81 = 7,419.94 : x
2. Step 2: Convert to fraction form
   13,388.15/18,475.81 = 7,419.94/x
3. Step 3: Cross multiply
   13,388.15x = 18,475.81 × 7,419.94
4. Step 4: Simplify right side
   13,388.15x = 137,089,336.91
5. Step 5: Solve for x
   x = 137,089,336.91/13,388.15
6. Step 6: Final answer
   x = 10,239.60