Finding the Fourth Proportional to 13,390.58, 18,477.30 and 7,422.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,390.58 : 18,477.30 = 7,422.20 : x
2. Step 2: Convert to fraction form
   13,390.58/18,477.30 = 7,422.20/x
3. Step 3: Cross multiply
   13,390.58x = 18,477.30 × 7,422.20
4. Step 4: Simplify right side
   13,390.58x = 137,142,086.56
5. Step 5: Solve for x
   x = 137,142,086.56/13,390.58
6. Step 6: Final answer
   x = 10,241.69