Finding the Fourth Proportional to 12,036.05, 18,057.15 and 5,013.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,036.05 : 18,057.15 = 5,013.72 : x
2. Step 2: Convert to fraction form
   12,036.05/18,057.15 = 5,013.72/x
3. Step 3: Cross multiply
   12,036.05x = 18,057.15 × 5,013.72
4. Step 4: Simplify right side
   12,036.05x = 90,533,494.10
5. Step 5: Solve for x
   x = 90,533,494.10/12,036.05
6. Step 6: Final answer
   x = 7,521.86