Finding the Fourth Proportional to 136,145.39, 204,004.71 and 86,119.81

Step by Step Solution

1. Step 1: Write the proportion equation
   136,145.39 : 204,004.71 = 86,119.81 : x
2. Step 2: Convert to fraction form
   136,145.39/204,004.71 = 86,119.81/x
3. Step 3: Cross multiply
   136,145.39x = 204,004.71 × 86,119.81
4. Step 4: Simplify right side
   136,145.39x = 17,568,846,354.29
5. Step 5: Solve for x
   x = 17,568,846,354.29/136,145.39
6. Step 6: Final answer
   x = 129,044.74