Finding the Fourth Proportional to 13,053.15, 18,013.61 and 7,387.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,053.15 : 18,013.61 = 7,387.89 : x
2. Step 2: Convert to fraction form
   13,053.15/18,013.61 = 7,387.89/x
3. Step 3: Cross multiply
   13,053.15x = 18,013.61 × 7,387.89
4. Step 4: Simplify right side
   13,053.15x = 133,082,569.18
5. Step 5: Solve for x
   x = 133,082,569.18/13,053.15
6. Step 6: Final answer
   x = 10,195.44