Finding the Fourth Proportional to 111,900.67, 154,128.76 and 86,009.70

Step by Step Solution

1. Step 1: Write the proportion equation
   111,900.67 : 154,128.76 = 86,009.70 : x
2. Step 2: Convert to fraction form
   111,900.67/154,128.76 = 86,009.70/x
3. Step 3: Cross multiply
   111,900.67x = 154,128.76 × 86,009.70
4. Step 4: Simplify right side
   111,900.67x = 13,256,568,267.91
5. Step 5: Solve for x
   x = 13,256,568,267.91/111,900.67
6. Step 6: Final answer
   x = 118,467.28