Finding the Fourth Proportional to 13,387.31, 18,475.15 and 7,419.01

Step by Step Solution

1. Step 1: Write the proportion equation
   13,387.31 : 18,475.15 = 7,419.01 : x
2. Step 2: Convert to fraction form
   13,387.31/18,475.15 = 7,419.01/x
3. Step 3: Cross multiply
   13,387.31x = 18,475.15 × 7,419.01
4. Step 4: Simplify right side
   13,387.31x = 137,067,322.60
5. Step 5: Solve for x
   x = 137,067,322.60/13,387.31
6. Step 6: Final answer
   x = 10,238.60