Finding the Fourth Proportional to 12,572.31, 18,857.71 and 7,013.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,572.31 : 18,857.71 = 7,013.18 : x
2. Step 2: Convert to fraction form
   12,572.31/18,857.71 = 7,013.18/x
3. Step 3: Cross multiply
   12,572.31x = 18,857.71 × 7,013.18
4. Step 4: Simplify right side
   12,572.31x = 132,252,570.53
5. Step 5: Solve for x
   x = 132,252,570.53/12,572.31
6. Step 6: Final answer
   x = 10,519.35