Finding the Fourth Proportional to 13,387.76, 18,474.82 and 7,419.07

Step by Step Solution

1. Step 1: Write the proportion equation
   13,387.76 : 18,474.82 = 7,419.07 : x
2. Step 2: Convert to fraction form
   13,387.76/18,474.82 = 7,419.07/x
3. Step 3: Cross multiply
   13,387.76x = 18,474.82 × 7,419.07
4. Step 4: Simplify right side
   13,387.76x = 137,065,982.82
5. Step 5: Solve for x
   x = 137,065,982.82/13,387.76
6. Step 6: Final answer
   x = 10,238.16