Finding the Fourth Proportional to 13,388.07, 18,475.32 and 7,419.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,388.07 : 18,475.32 = 7,419.72 : x
2. Step 2: Convert to fraction form
   13,388.07/18,475.32 = 7,419.72/x
3. Step 3: Cross multiply
   13,388.07x = 18,475.32 × 7,419.72
4. Step 4: Simplify right side
   13,388.07x = 137,081,701.31
5. Step 5: Solve for x
   x = 137,081,701.31/13,388.07
6. Step 6: Final answer
   x = 10,239.09