Finding the Fourth Proportional to 13,359.59, 18,435.90 and 7,391.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,359.59 : 18,435.90 = 7,391.12 : x
2. Step 2: Convert to fraction form
   13,359.59/18,435.90 = 7,391.12/x
3. Step 3: Cross multiply
   13,359.59x = 18,435.90 × 7,391.12
4. Step 4: Simplify right side
   13,359.59x = 136,261,857.03
5. Step 5: Solve for x
   x = 136,261,857.03/13,359.59
6. Step 6: Final answer
   x = 10,199.56