Finding the Fourth Proportional to 153,171.72, 211,375.09 and 86,103.72

Step by Step Solution

1. Step 1: Write the proportion equation
   153,171.72 : 211,375.09 = 86,103.72 : x
2. Step 2: Convert to fraction form
   153,171.72/211,375.09 = 86,103.72/x
3. Step 3: Cross multiply
   153,171.72x = 211,375.09 × 86,103.72
4. Step 4: Simplify right side
   153,171.72x = 18,200,181,564.33
5. Step 5: Solve for x
   x = 18,200,181,564.33/153,171.72
6. Step 6: Final answer
   x = 118,822.07