Finding the Fourth Proportional to 13,359.11, 18,435.69 and 7,390.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,359.11 : 18,435.69 = 7,390.89 : x
2. Step 2: Convert to fraction form
   13,359.11/18,435.69 = 7,390.89/x
3. Step 3: Cross multiply
   13,359.11x = 18,435.69 × 7,390.89
4. Step 4: Simplify right side
   13,359.11x = 136,256,156.86
5. Step 5: Solve for x
   x = 136,256,156.86/13,359.11
6. Step 6: Final answer
   x = 10,199.50