Finding the Fourth Proportional to 13,139.02, 18,132.03 and 7,836.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.02 : 18,132.03 = 7,836.91 : x
2. Step 2: Convert to fraction form
   13,139.02/18,132.03 = 7,836.91/x
3. Step 3: Cross multiply
   13,139.02x = 18,132.03 × 7,836.91
4. Step 4: Simplify right side
   13,139.02x = 142,099,087.23
5. Step 5: Solve for x
   x = 142,099,087.23/13,139.02
6. Step 6: Final answer
   x = 10,815.04