Finding the Fourth Proportional to 13,356.45, 18,431.69 and 7,388.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,356.45 : 18,431.69 = 7,388.10 : x
2. Step 2: Convert to fraction form
   13,356.45/18,431.69 = 7,388.10/x
3. Step 3: Cross multiply
   13,356.45x = 18,431.69 × 7,388.10
4. Step 4: Simplify right side
   13,356.45x = 136,175,131.95
5. Step 5: Solve for x
   x = 136,175,131.95/13,356.45
6. Step 6: Final answer
   x = 10,195.46