Finding the Fourth Proportional to 13,142.52, 18,139.02 and 7,837.68

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.52 : 18,139.02 = 7,837.68 : x
2. Step 2: Convert to fraction form
   13,142.52/18,139.02 = 7,837.68/x
3. Step 3: Cross multiply
   13,142.52x = 18,139.02 × 7,837.68
4. Step 4: Simplify right side
   13,142.52x = 142,167,834.27
5. Step 5: Solve for x
   x = 142,167,834.27/13,142.52
6. Step 6: Final answer
   x = 10,817.40