Finding the Fourth Proportional to 13,388.31, 18,474.54 and 7,419.83

Step by Step Solution

1. Step 1: Write the proportion equation
   13,388.31 : 18,474.54 = 7,419.83 : x
2. Step 2: Convert to fraction form
   13,388.31/18,474.54 = 7,419.83/x
3. Step 3: Cross multiply
   13,388.31x = 18,474.54 × 7,419.83
4. Step 4: Simplify right side
   13,388.31x = 137,077,853.76
5. Step 5: Solve for x
   x = 137,077,853.76/13,388.31
6. Step 6: Final answer
   x = 10,238.62