Finding the Fourth Proportional to 111,570.40, 154,027.20 and 86,020.71

Step by Step Solution

1. Step 1: Write the proportion equation
   111,570.40 : 154,027.20 = 86,020.71 : x
2. Step 2: Convert to fraction form
   111,570.40/154,027.20 = 86,020.71/x
3. Step 3: Cross multiply
   111,570.40x = 154,027.20 × 86,020.71
4. Step 4: Simplify right side
   111,570.40x = 13,249,529,103.31
5. Step 5: Solve for x
   x = 13,249,529,103.31/111,570.40
6. Step 6: Final answer
   x = 118,754.88