Finding the Fourth Proportional to 103,667.67, 155,808.24 and 86,012.86

Step by Step Solution

1. Step 1: Write the proportion equation
   103,667.67 : 155,808.24 = 86,012.86 : x
2. Step 2: Convert to fraction form
   103,667.67/155,808.24 = 86,012.86/x
3. Step 3: Cross multiply
   103,667.67x = 155,808.24 × 86,012.86
4. Step 4: Simplify right side
   103,667.67x = 13,401,512,333.97
5. Step 5: Solve for x
   x = 13,401,512,333.97/103,667.67
6. Step 6: Final answer
   x = 129,273.79