Finding the Fourth Proportional to 12,851.81, 17,736.57 and 7,187.03

Step by Step Solution

1. Step 1: Write the proportion equation
   12,851.81 : 17,736.57 = 7,187.03 : x
2. Step 2: Convert to fraction form
   12,851.81/17,736.57 = 7,187.03/x
3. Step 3: Cross multiply
   12,851.81x = 17,736.57 × 7,187.03
4. Step 4: Simplify right side
   12,851.81x = 127,473,238.52
5. Step 5: Solve for x
   x = 127,473,238.52/12,851.81
6. Step 6: Final answer
   x = 9,918.70