Finding the Fourth Proportional to 13,290.30, 19,901.43 and 7,419.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,290.30 : 19,901.43 = 7,419.42 : x
2. Step 2: Convert to fraction form
   13,290.30/19,901.43 = 7,419.42/x
3. Step 3: Cross multiply
   13,290.30x = 19,901.43 × 7,419.42
4. Step 4: Simplify right side
   13,290.30x = 147,657,067.77
5. Step 5: Solve for x
   x = 147,657,067.77/13,290.30
6. Step 6: Final answer
   x = 11,110.14